21022021100 has 36 divisors (see below), whose sum is σ = 45629241000. Its totient is φ = 8406696960.

The previous prime is 21022021067. The next prime is 21022021157. The reversal of 21022021100 is 112022012.

It is a happy number.

It is a super-2 number, since 2×21022021100² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409676 + ... + 458124.

Almost surely, 2^21022021100 is an apocalyptic number.

21022021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022021100 is an abundant number, since it is smaller than the sum of its proper divisors (24607219900).

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

21022021100 is a wasteful number, since it uses less digits than its factorization.

21022021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52802 (or 52795 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21022021100 its reverse (112022012), we get a palindrome (21134043112).

It can be divided in two parts, 2102 and 2021100, that added together give a palindrome (2023202).

The spelling of 21022021100 in words is "twenty-one billion, twenty-two million, twenty-one thousand, one hundred".