21012132312 has 48 divisors (see below), whose sum is σ = 58295863080. Its totient is φ = 6833212800.

The previous prime is 21012132283. The next prime is 21012132329. The reversal of 21012132312 is 21323121012.

21012132312 is a `hidden beast` number, since 210 + 12 + 132 + 312 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3556014 + ... + 3561917.

Almost surely, 2^21012132312 is an apocalyptic number.

It is an amenable number.

21012132312 is an abundant number, since it is smaller than the sum of its proper divisors (37283730768).

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

21012132312 is a wasteful number, since it uses less digits than its factorization.

21012132312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7117984 (or 7117977 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21012132312 its reverse (21323121012), we get a palindrome (42335253324).

The spelling of 21012132312 in words is "twenty-one billion, twelve million, one hundred thirty-two thousand, three hundred twelve".