21001010120200 has 96 divisors (see below), whose sum is σ = 53268160842720. Its totient is φ = 7636449600000.

The previous prime is 21001010120173. The next prime is 21001010120203. The reversal of 21001010120200 is 202101010012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21001010120203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65049175 + ... + 65371225.

It is an arithmetic number, because the mean of its divisors is an integer number (554876675445).

Almost surely, 2^{21001010120200} is an apocalyptic number.

21001010120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001010120200 is an abundant number, since it is smaller than the sum of its proper divisors (32267150722520).

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

21001010120200 is a wasteful number, since it uses less digits than its factorization.

21001010120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351719 (or 351710 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001010120200 its reverse (202101010012), we get a palindrome (21203111130212).

The spelling of 21001010120200 in words is "twenty-one trillion, one billion, ten million, one hundred twenty thousand, two hundred".