21031013112 has 32 divisors (see below), whose sum is σ = 52630328400. Its totient is φ = 7003298304.

The previous prime is 21031013093. The next prime is 21031013131. The reversal of 21031013112 is 21131013012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21031013093) and next prime (21031013131).

It is a junction number, because it is equal to n+sod(n) for n = 21031013091 and 21031013100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415537 + ... + 463392.

Almost surely, 2^21031013112 is an apocalyptic number.

It is an amenable number.

21031013112 is an abundant number, since it is smaller than the sum of its proper divisors (31599315288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031013112 is a wasteful number, since it uses less digits than its factorization.

21031013112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879935 (or 879931 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21031013112 its reverse (21131013012), we get a palindrome (42162026124).

The spelling of 21031013112 in words is "twenty-one billion, thirty-one million, thirteen thousand, one hundred twelve".