21131331034 has 16 divisors (see below), whose sum is σ = 34620282720. Its totient is φ = 9593555760.

The previous prime is 21131330963. The next prime is 21131331073. The reversal of 21131331034 is 43013313112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21131330996 and 21131331014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561084 + ... + 597559.

It is an arithmetic number, because the mean of its divisors is an integer number (2163767670).

Almost surely, 2^21131331034 is an apocalyptic number.

21131331034 is a deficient number, since it is larger than the sum of its proper divisors (13488951686).

21131331034 is a wasteful number, since it uses less digits than its factorization.

21131331034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159485.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21131331034 its reverse (43013313112), we get a palindrome (64144644146).

The spelling of 21131331034 in words is "twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, thirty-four".