21112212220000 has 120 divisors (see below), whose sum is σ = 56660955746472. Its totient is φ = 7677168000000.

The previous prime is 21112212219991. The next prime is 21112212220031. The reversal of 21112212220000 is 2221221112.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 47762301 + ... + 48202300.

Almost surely, 2^{21112212220000} is an apocalyptic number.

21112212220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112212220000 is an abundant number, since it is smaller than the sum of its proper divisors (35548743526472).

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

21112212220000 is an equidigital number, since it uses as much as digits as its factorization.

21112212220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95964642 (or 95964619 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112212220000 its reverse (2221221112), we get a palindrome (21114433441112).

The spelling of 21112212220000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred twenty thousand".