21210120102100 has 36 divisors (see below), whose sum is σ = 46030036528000. Its totient is φ = 8483296721760.

The previous prime is 21210120102071. The next prime is 21210120102151. The reversal of 21210120102100 is 120102101212.

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, 8255940 + ... + 10515739.

Almost surely, 2^{21210120102100} is an apocalyptic number.

21210120102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210120102100 is an abundant number, since it is smaller than the sum of its proper divisors (24819916425900).

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

21210120102100 is a wasteful number, since it uses less digits than its factorization.

21210120102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18782992 (or 18782985 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210120102100 its reverse (120102101212), we get a palindrome (21330222203312).

The spelling of 21210120102100 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one hundred two thousand, one hundred".