21253212052601 has 8 divisors (see below), whose sum is σ = 21256538375424. Its totient is φ = 21249886003920.

The previous prime is 21253212052591. The next prime is 21253212052603. The reversal of 21253212052601 is 10625021235212.

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 21253212052601 - 2³⁴ = 21236032183417 is a prime.

It is a super-3 number, since 3×21253212052601³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21253212052603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196503800 + ... + 196611926.

It is an arithmetic number, because the mean of its divisors is an integer number (2657067296928).

Almost surely, 2^{21253212052601} is an apocalyptic number.

It is an amenable number.

21253212052601 is a deficient number, since it is larger than the sum of its proper divisors (3326322823).

21253212052601 is a wasteful number, since it uses less digits than its factorization.

21253212052601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137071.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21253212052601 its reverse (10625021235212), we get a palindrome (31878233287813).

The spelling of 21253212052601 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred twelve million, fifty-two thousand, six hundred one".