21001000112112 has 80 divisors (see below), whose sum is σ = 54297962957952. Its totient is φ = 6994479348480.

The previous prime is 21001000112069. The next prime is 21001000112117. The reversal of 21001000112112 is 21121100010012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001000112117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 656655162 + ... + 656687142.

Almost surely, 2^{21001000112112} is an apocalyptic number.

It is an amenable number.

21001000112112 is an abundant number, since it is smaller than the sum of its proper divisors (33296962845840).

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

21001000112112 is a wasteful number, since it uses less digits than its factorization.

21001000112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43006 (or 43000 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001000112112 its reverse (21121100010012), we get a palindrome (42122100122124).

The spelling of 21001000112112 in words is "twenty-one trillion, one billion, one hundred twelve thousand, one hundred twelve".