31300021312 has 56 divisors (see below), whose sum is σ = 71088601536. Its totient is φ = 13394523648.

The previous prime is 31300021309. The next prime is 31300021327. The reversal of 31300021312 is 21312000313.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254838 + ... + 357130.

Almost surely, 2^31300021312 is an apocalyptic number.

31300021312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31300021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35544300768).

31300021312 is an abundant number, since it is smaller than the sum of its proper divisors (39788580224).

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

31300021312 is a wasteful number, since it uses less digits than its factorization.

31300021312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102995 (or 102985 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31300021312 its reverse (21312000313), we get a palindrome (52612021625).

The spelling of 31300021312 in words is "thirty-one billion, three hundred million, twenty-one thousand, three hundred twelve".