21110322131 has 4 divisors (see below), whose sum is σ = 21112777200. Its totient is φ = 21107867064.

The previous prime is 21110322097. The next prime is 21110322137. The reversal of 21110322131 is 13122301112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110322131 - 2¹⁰ = 21110321107 is a prime.

It is a super-2 number, since 2×21110322131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110322137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1214591 + ... + 1231848.

It is an arithmetic number, because the mean of its divisors is an integer number (5278194300).

Almost surely, 2^21110322131 is an apocalyptic number.

21110322131 is a deficient number, since it is larger than the sum of its proper divisors (2455069).

21110322131 is an equidigital number, since it uses as much as digits as its factorization.

21110322131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455068.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21110322131 its reverse (13122301112), we get a palindrome (34232623243).

The spelling of 21110322131 in words is "twenty-one billion, one hundred ten million, three hundred twenty-two thousand, one hundred thirty-one".