21310113222021 has 96 divisors (see below), whose sum is σ = 32212617338880. Its totient is φ = 12501754417152.

The previous prime is 21310113222019. The next prime is 21310113222023. The reversal of 21310113222021 is 12022231101312.

It is an interprime number because it is at equal distance from previous prime (21310113222019) and next prime (21310113222023).

It is not a de Polignac number, because 21310113222021 - 2¹ = 21310113222019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310113222023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6793148965 + ... + 6793152101.

It is an arithmetic number, because the mean of its divisors is an integer number (335548097280).

Almost surely, 2^{21310113222021} is an apocalyptic number.

It is an amenable number.

21310113222021 is a deficient number, since it is larger than the sum of its proper divisors (10902504116859).

21310113222021 is a wasteful number, since it uses less digits than its factorization.

21310113222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955 (or 4942 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21310113222021 its reverse (12022231101312), we get a palindrome (33332344323333).

The spelling of 21310113222021 in words is "twenty-one trillion, three hundred ten billion, one hundred thirteen million, two hundred twenty-two thousand, twenty-one".