21310323111 has 24 divisors (see below), whose sum is σ = 38377033344. Its totient is φ = 11070297360.

The previous prime is 21310323091. The next prime is 21310323119. The reversal of 21310323111 is 11132301312.

21310323111 is a `hidden beast` number, since 21 + 310 + 323 + 1 + 11 = 666.

It is not a de Polignac number, because 21310323111 - 2⁵ = 21310323079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310323119) 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, 15374721 + ... + 15376106.

It is an arithmetic number, because the mean of its divisors is an integer number (1599043056).

Almost surely, 2^21310323111 is an apocalyptic number.

21310323111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21310323111 is a deficient number, since it is larger than the sum of its proper divisors (17066710233).

21310323111 is a wasteful number, since it uses less digits than its factorization.

21310323111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30750851 (or 30750848 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21310323111 its reverse (11132301312), we get a palindrome (32442624423).

The spelling of 21310323111 in words is "twenty-one billion, three hundred ten million, three hundred twenty-three thousand, one hundred eleven".