210021100012100 has 72 divisors (see below), whose sum is σ = 516634900333440. Its totient is φ = 73464870602880.

The previous prime is 210021100012099. The next prime is 210021100012123. The reversal of 210021100012100 is 1210001120012.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4251414572 + ... + 4251463971.

Almost surely, 2^{210021100012100} is an apocalyptic number.

210021100012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210021100012100 is an abundant number, since it is smaller than the sum of its proper divisors (306613800321340).

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

210021100012100 is a wasteful number, since it uses less digits than its factorization.

210021100012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8502878589 (or 8502878582 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210021100012100 its reverse (1210001120012), we get a palindrome (211231101132112).

The spelling of 210021100012100 in words is "two hundred ten trillion, twenty-one billion, one hundred million, twelve thousand, one hundred".