22122210211220 has 72 divisors (see below), whose sum is σ = 54194491860264. Its totient is φ = 7563271102464.

The previous prime is 22122210211219. The next prime is 22122210211229. The reversal of 22122210211220 is 2211201222122.

It can be written as a sum of positive squares in 4 ways, for example, as 855613900036 + 21266596311184 = 924994^2 + 4611572^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22122210211192 and 22122210211201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122210211229) 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, 31628117 + ... + 32319996.

It is an arithmetic number, because the mean of its divisors is an integer number (752701275837).

Almost surely, 2^{22122210211220} is an apocalyptic number.

22122210211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22122210211220 is an abundant number, since it is smaller than the sum of its proper divisors (32072281649044).

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

22122210211220 is a wasteful number, since it uses less digits than its factorization.

22122210211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63948489 (or 63948480 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22122210211220 its reverse (2211201222122), we get a palindrome (24333411433342).

The spelling of 22122210211220 in words is "twenty-two trillion, one hundred twenty-two billion, two hundred ten million, two hundred eleven thousand, two hundred twenty".