21201022102200 has 48 divisors (see below), whose sum is σ = 65723168518680. Its totient is φ = 5653605893760.

The previous prime is 21201022102153. The next prime is 21201022102207. The reversal of 21201022102200 is 220122010212.

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 21201022102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022102207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17667517819 + ... + 17667519018.

Almost surely, 2^{21201022102200} is an apocalyptic number.

21201022102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201022102200 is an abundant number, since it is smaller than the sum of its proper divisors (44522146416480).

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

21201022102200 is a wasteful number, since it uses less digits than its factorization.

21201022102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35335036856 (or 35335036847 counting only the distinct ones).

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

Adding to 21201022102200 its reverse (220122010212), we get a palindrome (21421144112412).

The spelling of 21201022102200 in words is "twenty-one trillion, two hundred one billion, twenty-two million, one hundred two thousand, two hundred".