21111102211212 has 72 divisors (see below), whose sum is σ = 60849647572896. Its totient is φ = 6113622357504.

The previous prime is 21111102211189. The next prime is 21111102211217. The reversal of 21111102211212 is 21211220111112.

It is a happy number.

21111102211212 is a `hidden beast` number, since 211 + 1 + 110 + 221 + 121 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21111102211217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1326733008 + ... + 1326748919.

It is an arithmetic number, because the mean of its divisors is an integer number (845133994068).

Almost surely, 2^{21111102211212} is an apocalyptic number.

It is an amenable number.

21111102211212 is an abundant number, since it is smaller than the sum of its proper divisors (39738545361684).

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

21111102211212 is a wasteful number, since it uses less digits than its factorization.

21111102211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653481967 (or 2653481962 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21111102211212 its reverse (21211220111112), we get a palindrome (42322322322324).

The spelling of 21111102211212 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, two hundred eleven thousand, two hundred twelve".