21100012212 has 48 divisors (see below), whose sum is σ = 51435417600. Its totient is φ = 6723561600.

The previous prime is 21100012189. The next prime is 21100012249. The reversal of 21100012212 is 21221000112.

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

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, 265012 + ... + 335307.

It is an arithmetic number, because the mean of its divisors is an integer number (1071571200).

Almost surely, 2^21100012212 is an apocalyptic number.

It is an amenable number.

21100012212 is an abundant number, since it is smaller than the sum of its proper divisors (30335405388).

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

21100012212 is a wasteful number, since it uses less digits than its factorization.

21100012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600456 (or 600454 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21100012212 its reverse (21221000112), we get a palindrome (42321012324).

The spelling of 21100012212 in words is "twenty-one billion, one hundred million, twelve thousand, two hundred twelve".