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21253212660061 = 211383262992497
BaseRepresentation
bin1001101010100011001100…
…01100001110000101011101
32210020210020221011211100201
410311101212030032011131
510241203034420110221
6113111331402423501
74322331264616354
oct465214614160535
983223227154321
1021253212660061
116854489527238
122473021b01b91
13bb22280c0535
14536937a3899b
1526cca14b5891
hex13546630e15d

21253212660061 has 8 divisors (see below), whose sum is σ = 21409693277184. Its totient is φ = 21097258029120.

The previous prime is 21253212660047. The next prime is 21253212660077. The reversal of 21253212660061 is 16006621235212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21253212660061 - 239 = 20703456846173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21253212660061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253212660041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131415436 + ... + 131577061.

It is an arithmetic number, because the mean of its divisors is an integer number (2676211659648).

Almost surely, 221253212660061 is an apocalyptic number.

It is an amenable number.

21253212660061 is a deficient number, since it is larger than the sum of its proper divisors (156480617123).

21253212660061 is a wasteful number, since it uses less digits than its factorization.

21253212660061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262993091.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 21253212660061 its reverse (16006621235212), we get a palindrome (37259833895273).

The spelling of 21253212660061 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twelve million, six hundred sixty thousand, sixty-one".

Divisors: 1 211 383 80813 262992497 55491416867 100726126351 21253212660061