21212211202100 has 36 divisors (see below), whose sum is σ = 46053388102848. Its totient is φ = 8480665164000.

The previous prime is 21212211202099. The next prime is 21212211202111. The reversal of 21212211202100 is 120211221212.

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, 52539356 + ... + 52941555.

Almost surely, 2^{21212211202100} is an apocalyptic number.

21212211202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212211202100 is an abundant number, since it is smaller than the sum of its proper divisors (24841176900748).

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

21212211202100 is a wasteful number, since it uses less digits than its factorization.

21212211202100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105482936 (or 105482929 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212211202100 its reverse (120211221212), we get a palindrome (21332422423312).

The spelling of 21212211202100 in words is "twenty-one trillion, two hundred twelve billion, two hundred eleven million, two hundred two thousand, one hundred".