21222210311220 has 96 divisors (see below), whose sum is σ = 62377054967808. Its totient is φ = 5380787032192.

The previous prime is 21222210311213. The next prime is 21222210311233. The reversal of 21222210311220 is 2211301222212.

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, 45812694 + ... + 46273613.

It is an arithmetic number, because the mean of its divisors is an integer number (649760989248).

Almost surely, 2^{21222210311220} is an apocalyptic number.

21222210311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222210311220 is an abundant number, since it is smaller than the sum of its proper divisors (41154844656588).

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

21222210311220 is a wasteful number, since it uses less digits than its factorization.

21222210311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92086509 (or 92086507 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21222210311220 its reverse (2211301222212), we get a palindrome (23433511533432).

The spelling of 21222210311220 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, three hundred eleven thousand, two hundred twenty".