21011020120200 has 96 divisors (see below), whose sum is σ = 71055449883360. Its totient is φ = 5093580633600.

The previous prime is 21011020120169. The next prime is 21011020120213. The reversal of 21011020120200 is 202102011012.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 1591737349 + ... + 1591750548.

It is an arithmetic number, because the mean of its divisors is an integer number (740160936285).

Almost surely, 2^{21011020120200} is an apocalyptic number.

21011020120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011020120200 is an abundant number, since it is smaller than the sum of its proper divisors (50044429763160).

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

21011020120200 is a wasteful number, since it uses less digits than its factorization.

21011020120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183487927 (or 3183487918 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21011020120200 its reverse (202102011012), we get a palindrome (21213122131212).

The spelling of 21011020120200 in words is "twenty-one trillion, eleven billion, twenty million, one hundred twenty thousand, two hundred".