22221122100 has 72 divisors (see below), whose sum is σ = 64309300608. Its totient is φ = 5924140800.

The previous prime is 22221122087. The next prime is 22221122107. The reversal of 22221122100 is 122112222.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22221122100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221122107) 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, 1714645 + ... + 1727555.

Almost surely, 2^22221122100 is an apocalyptic number.

22221122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221122100 is an abundant number, since it is smaller than the sum of its proper divisors (42088178508).

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

22221122100 is a wasteful number, since it uses less digits than its factorization.

22221122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18665 (or 18658 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22221122100 its reverse (122112222), we get a palindrome (22343234322).

The spelling of 22221122100 in words is "twenty-two billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred".