21022022100 has 36 divisors (see below), whose sum is σ = 60823718144. Its totient is φ = 5605872480.

The previous prime is 21022022071. The next prime is 21022022101. The reversal of 21022022100 is 122022012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022022101) 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, 35036404 + ... + 35037003.

Almost surely, 2^21022022100 is an apocalyptic number.

21022022100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022022100 is an abundant number, since it is smaller than the sum of its proper divisors (39801696044).

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

21022022100 is a wasteful number, since it uses less digits than its factorization.

21022022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70073424 (or 70073417 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21022022100 its reverse (122022012), we get a palindrome (21144044112).

It can be divided in two parts, 2102 and 2022100, that added together give a palindrome (2024202).

The spelling of 21022022100 in words is "twenty-one billion, twenty-two million, twenty-two thousand, one hundred".