22021210100 has 36 divisors (see below), whose sum is σ = 50596972524. Its totient is φ = 8290337280.

The previous prime is 22021210093. The next prime is 22021210129. The reversal of 22021210100 is 101212022.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 312723856 + 21708486244 = 17684^2 + 147338^2 .

It is a congruent number.

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, 6475127 + ... + 6478526.

It is an arithmetic number, because the mean of its divisors is an integer number (1405471459).

Almost surely, 2^22021210100 is an apocalyptic number.

22021210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021210100 is an abundant number, since it is smaller than the sum of its proper divisors (28575762424).

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

22021210100 is a wasteful number, since it uses less digits than its factorization.

22021210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12953684 (or 12953677 counting only the distinct ones).

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

Adding to 22021210100 its reverse (101212022), we get a palindrome (22122422122).

The spelling of 22021210100 in words is "twenty-two billion, twenty-one million, two hundred ten thousand, one hundred".