21001211112112 has 80 divisors (see below), whose sum is σ = 53714327634432. Its totient is φ = 7700978856960.

The previous prime is 21001211112073. The next prime is 21001211112113. The reversal of 21001211112112 is 21121111210012.

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

It is not an unprimeable number, because it can be changed into a prime (21001211112113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501344868 + ... + 501386755.

Almost surely, 2^{21001211112112} is an apocalyptic number.

21001211112112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001211112112 is an abundant number, since it is smaller than the sum of its proper divisors (32713116522320).

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

21001211112112 is a wasteful number, since it uses less digits than its factorization.

21001211112112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002731666 (or 1002731660 counting only the distinct ones).

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

Adding to 21001211112112 its reverse (21121111210012), we get a palindrome (42122322322124).

The spelling of 21001211112112 in words is "twenty-one trillion, one billion, two hundred eleven million, one hundred twelve thousand, one hundred twelve".