22121222221100 has 36 divisors (see below), whose sum is σ = 48120419184600. Its totient is φ = 8826854424960.

The previous prime is 22121222221069. The next prime is 22121222221103. The reversal of 22121222221100 is 112222212122.

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

It is not an unprimeable number, because it can be changed into a prime (22121222221103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270389690 + ... + 270471489.

Almost surely, 2^{22121222221100} is an apocalyptic number.

22121222221100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121222221100 is an abundant number, since it is smaller than the sum of its proper divisors (25999196963500).

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

22121222221100 is a wasteful number, since it uses less digits than its factorization.

22121222221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540861602 (or 540861595 counting only the distinct ones).

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

Adding to 22121222221100 its reverse (112222212122), we get a palindrome (22233444433222).

The spelling of 22121222221100 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred".