21202022102100 has 144 divisors (see below), whose sum is σ = 70110613966848. Its totient is φ = 4845997157760.

The previous prime is 21202022102099. The next prime is 21202022102117. The reversal of 21202022102100 is 120122020212.

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 21202022102100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61414569 + ... + 61758831.

Almost surely, 2^{21202022102100} is an apocalyptic number.

21202022102100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202022102100 is an abundant number, since it is smaller than the sum of its proper divisors (48908591864748).

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

21202022102100 is a wasteful number, since it uses less digits than its factorization.

21202022102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373614 (or 373607 counting only the distinct ones).

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

Adding to 21202022102100 its reverse (120122020212), we get a palindrome (21322144122312).

The spelling of 21202022102100 in words is "twenty-one trillion, two hundred two billion, twenty-two million, one hundred two thousand, one hundred".