21111231000312 has 64 divisors (see below), whose sum is σ = 59222925309600. Its totient is φ = 6967402963200.

The previous prime is 21111231000287. The next prime is 21111231000337. The reversal of 21111231000312 is 21300013211112.

21111231000312 is a `hidden beast` number, since 21 + 11 + 12 + 310 + 0 + 0 + 312 = 666.

It is an interprime number because it is at equal distance from previous prime (21111231000287) and next prime (21111231000337).

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 15 ways as a sum of consecutive naturals, for example, 483825613 + ... + 483869244.

Almost surely, 2^{21111231000312} is an apocalyptic number.

It is an amenable number.

21111231000312 is an abundant number, since it is smaller than the sum of its proper divisors (38111694309288).

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

21111231000312 is a wasteful number, since it uses less digits than its factorization.

21111231000312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 967694973 (or 967694963 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21111231000312 its reverse (21300013211112), we get a palindrome (42411244211424).

The spelling of 21111231000312 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty-one million, three hundred twelve", and thus it is an aban number.