21010113321 has 24 divisors (see below), whose sum is σ = 29271892320. Its totient is φ = 13402445760.

The previous prime is 21010113317. The next prime is 21010113353. The reversal of 21010113321 is 12331101012.

It is a happy number.

It is not a de Polignac number, because 21010113321 - 2² = 21010113317 is a prime.

It is a super-2 number, since 2×21010113321² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010113321.

It is not an unprimeable number, because it can be changed into a prime (21010113361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 215646 + ... + 297528.

It is an arithmetic number, because the mean of its divisors is an integer number (1219662180).

Almost surely, 2^21010113321 is an apocalyptic number.

It is an amenable number.

21010113321 is a deficient number, since it is larger than the sum of its proper divisors (8261778999).

21010113321 is an equidigital number, since it uses as much as digits as its factorization.

21010113321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82037 (or 82006 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21010113321 its reverse (12331101012), we get a palindrome (33341214333).

The spelling of 21010113321 in words is "twenty-one billion, ten million, one hundred thirteen thousand, three hundred twenty-one".