22121210100 has 72 divisors (see below), whose sum is σ = 69822593568. Its totient is φ = 5362716800.

The previous prime is 22121210081. The next prime is 22121210131. The reversal of 22121210100 is 101212122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3348399 + ... + 3354998.

It is an arithmetic number, because the mean of its divisors is an integer number (969758244).

Almost surely, 2^22121210100 is an apocalyptic number.

22121210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121210100 is an abundant number, since it is smaller than the sum of its proper divisors (47701383468).

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

22121210100 is a wasteful number, since it uses less digits than its factorization.

22121210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6703425 (or 6703418 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22121210100 its reverse (101212122), we get a palindrome (22222422222).

It can be divided in two parts, 22121 and 210100, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 22121210100 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, one hundred".