21202202100 has 36 divisors (see below), whose sum is σ = 61345038944. Its totient is φ = 5653920480.

The previous prime is 21202202057. The next prime is 21202202107. The reversal of 21202202100 is 120220212.

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 (21202202107) 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, 35336704 + ... + 35337303.

Almost surely, 2^21202202100 is an apocalyptic number.

21202202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202202100 is an abundant number, since it is smaller than the sum of its proper divisors (40142836844).

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

21202202100 is a wasteful number, since it uses less digits than its factorization.

21202202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70674024 (or 70674017 counting only the distinct ones).

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

Adding to 21202202100 its reverse (120220212), we get a palindrome (21322422312).

The spelling of 21202202100 in words is "twenty-one billion, two hundred two million, two hundred two thousand, one hundred".