21103222100 has 72 divisors (see below), whose sum is σ = 49759315200. Its totient is φ = 7739020800.

The previous prime is 21103222097. The next prime is 21103222103. The reversal of 21103222100 is 122230112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21103222097) and next prime (21103222103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103222103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120245 + ... + 238044.

It is an arithmetic number, because the mean of its divisors is an integer number (691101600).

Almost surely, 2^21103222100 is an apocalyptic number.

21103222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103222100 is an abundant number, since it is smaller than the sum of its proper divisors (28656093100).

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

21103222100 is a wasteful number, since it uses less digits than its factorization.

21103222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358353 (or 358346 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21103222100 its reverse (122230112), we get a palindrome (21225452212).

The spelling of 21103222100 in words is "twenty-one billion, one hundred three million, two hundred twenty-two thousand, one hundred".