21023131113 has 24 divisors (see below), whose sum is σ = 30681857856. Its totient is φ = 13870116000.

The previous prime is 21023131099. The next prime is 21023131133. The reversal of 21023131113 is 31113132012.

It is not a de Polignac number, because 21023131113 - 2¹³ = 21023122921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21023131133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2620278 + ... + 2628288.

It is an arithmetic number, because the mean of its divisors is an integer number (1278410744).

Almost surely, 2^21023131113 is an apocalyptic number.

It is an amenable number.

21023131113 is a deficient number, since it is larger than the sum of its proper divisors (9658726743).

21023131113 is a wasteful number, since it uses less digits than its factorization.

21023131113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11005 (or 11002 counting only the distinct ones).

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

Adding to 21023131113 its reverse (31113132012), we get a palindrome (52136263125).

The spelling of 21023131113 in words is "twenty-one billion, twenty-three million, one hundred thirty-one thousand, one hundred thirteen".