21122222201220 has 96 divisors (see below), whose sum is σ = 67602420055296. Its totient is φ = 4827128716800.

The previous prime is 21122222201203. The next prime is 21122222201231. The reversal of 21122222201220 is 2210222222112.

It is a super-2 number, since 2×21122222201220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 1692211 + ... + 6716250.

It is an arithmetic number, because the mean of its divisors is an integer number (704191875576).

Almost surely, 2^{21122222201220} is an apocalyptic number.

21122222201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122222201220 is an abundant number, since it is smaller than the sum of its proper divisors (46480197854076).

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

21122222201220 is a wasteful number, since it uses less digits than its factorization.

21122222201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414461 (or 8414459 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21122222201220 its reverse (2210222222112), we get a palindrome (23332444423332).

The spelling of 21122222201220 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-two million, two hundred one thousand, two hundred twenty".