21122020210202 has 4 divisors (see below), whose sum is σ = 31683030315306. Its totient is φ = 10561010105100.

The previous prime is 21122020210169. The next prime is 21122020210279. The reversal of 21122020210202 is 20201202022112.

It is a happy number.

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., 20263601283121 + 858418927081 = 4501511^2 + 926509^2 .

It is a super-2 number, since 2×21122020210202² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280505052549 + ... + 5280505052552.

Almost surely, 2^{21122020210202} is an apocalyptic number.

21122020210202 is a deficient number, since it is larger than the sum of its proper divisors (10561010105104).

21122020210202 is a wasteful number, since it uses less digits than its factorization.

21122020210202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561010105103.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21122020210202 its reverse (20201202022112), we get a palindrome (41323222232314).

The spelling of 21122020210202 in words is "twenty-one trillion, one hundred twenty-two billion, twenty million, two hundred ten thousand, two hundred two".