21310113021 has 8 divisors (see below), whose sum is σ = 28418191584. Its totient is φ = 14204388240.

The previous prime is 21310113017. The next prime is 21310113029. The reversal of 21310113021 is 12031101312.

It is a happy number.

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

It is not a de Polignac number, because 21310113021 - 2² = 21310113017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310113029) 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, 567210 + ... + 603611.

It is an arithmetic number, because the mean of its divisors is an integer number (3552273948).

Almost surely, 2^21310113021 is an apocalyptic number.

It is an amenable number.

21310113021 is a deficient number, since it is larger than the sum of its proper divisors (7108078563).

21310113021 is a wasteful number, since it uses less digits than its factorization.

21310113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176891.

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

Adding to 21310113021 its reverse (12031101312), we get a palindrome (33341214333).

The spelling of 21310113021 in words is "twenty-one billion, three hundred ten million, one hundred thirteen thousand, twenty-one".