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21010201221 = 313751119711
BaseRepresentation
bin10011100100010011…
…100011101010000101
32000020020101210210210
4103210103203222011
5321012102414341
613352453310033
71342436522652
oct234423435205
960206353723
1021010201221
118a01790169
1240a4335319
131c9aa77139
14103452ac29
1582e7b4c16
hex4e44e3a85

21010201221 has 8 divisors (see below), whose sum is σ = 28218081024. Its totient is φ = 13904561120.

The previous prime is 21010201193. The next prime is 21010201229. The reversal of 21010201221 is 12210201012.

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 21010201221 - 25 = 21010201189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010201197 and 21010201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010201229) 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, 25559445 + ... + 25560266.

It is an arithmetic number, because the mean of its divisors is an integer number (3527260128).

Almost surely, 221010201221 is an apocalyptic number.

It is an amenable number.

21010201221 is a deficient number, since it is larger than the sum of its proper divisors (7207879803).

21010201221 is a wasteful number, since it uses less digits than its factorization.

21010201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51119851.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010201221 its reverse (12210201012), we get a palindrome (33220402233).

The spelling of 21010201221 in words is "twenty-one billion, ten million, two hundred one thousand, two hundred twenty-one".

Divisors: 1 3 137 411 51119711 153359133 7003400407 21010201221