21202020102202 has 4 divisors (see below), whose sum is σ = 31803030153306. Its totient is φ = 10601010051100.

The previous prime is 21202020102191. The next prime is 21202020102217. The reversal of 21202020102202 is 20220102020212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20688861347001 + 513158755201 = 4548501^2 + 716351^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300505025549 + ... + 5300505025552.

Almost surely, 2^{21202020102202} is an apocalyptic number.

21202020102202 is a deficient number, since it is larger than the sum of its proper divisors (10601010051104).

21202020102202 is a wasteful number, since it uses less digits than its factorization.

21202020102202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601010051103.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202020102202 its reverse (20220102020212), we get a palindrome (41422122122414).

The spelling of 21202020102202 in words is "twenty-one trillion, two hundred two billion, twenty million, one hundred two thousand, two hundred two".