21010111012212 has 96 divisors (see below), whose sum is σ = 57967017400320. Its totient is φ = 5795083647360.

The previous prime is 21010111012193. The next prime is 21010111012223. The reversal of 21010111012212 is 21221011101012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010111012191 and 21010111012200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16957887 + ... + 18154617.

It is an arithmetic number, because the mean of its divisors is an integer number (603823097920).

Almost surely, 2^{21010111012212} is an apocalyptic number.

It is an amenable number.

21010111012212 is an abundant number, since it is smaller than the sum of its proper divisors (36956906388108).

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

21010111012212 is a wasteful number, since it uses less digits than its factorization.

21010111012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203981 (or 1203979 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21010111012212 its reverse (21221011101012), we get a palindrome (42231122113224).

The spelling of 21010111012212 in words is "twenty-one trillion, ten billion, one hundred eleven million, twelve thousand, two hundred twelve".