22101221011220 has 24 divisors (see below), whose sum is σ = 49982761364424. Its totient is φ = 8160450834816.

The previous prime is 22101221011187. The next prime is 22101221011229. The reversal of 22101221011220 is 2211012210122.

It can be written as a sum of positive squares in 4 ways, for example, as 3361912324 + 22097859098896 = 57982^2 + 4700836^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101221011229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42502347839 + ... + 42502348358.

It is an arithmetic number, because the mean of its divisors is an integer number (2082615056851).

Almost surely, 2^{22101221011220} is an apocalyptic number.

22101221011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22101221011220 is an abundant number, since it is smaller than the sum of its proper divisors (27881540353204).

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

22101221011220 is a wasteful number, since it uses less digits than its factorization.

22101221011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85004696219 (or 85004696217 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 22101221011220 its reverse (2211012210122), we get a palindrome (24312233221342).

The spelling of 22101221011220 in words is "twenty-two trillion, one hundred one billion, two hundred twenty-one million, eleven thousand, two hundred twenty".