21200201202120 has 64 divisors (see below), whose sum is σ = 63620712429120. Its totient is φ = 5651599536384.

The previous prime is 21200201202113. The next prime is 21200201202139. The reversal of 21200201202120 is 2120210200212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200201202120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27547779 + ... + 28306898.

It is an arithmetic number, because the mean of its divisors is an integer number (994073631705).

Almost surely, 2^{21200201202120} is an apocalyptic number.

21200201202120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200201202120 is an abundant number, since it is smaller than the sum of its proper divisors (42420511227000).

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

21200201202120 is a wasteful number, since it uses less digits than its factorization.

21200201202120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55857854 (or 55857850 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200201202120 its reverse (2120210200212), we get a palindrome (23320411402332).

The spelling of 21200201202120 in words is "twenty-one trillion, two hundred billion, two hundred one million, two hundred two thousand, one hundred twenty".