21112222202 has 4 divisors (see below), whose sum is σ = 31668333306. Its totient is φ = 10556111100.

The previous prime is 21112222181. The next prime is 21112222211. The reversal of 21112222202 is 20222221112.

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., 20955747121 + 156475081 = 144761^2 + 12509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278055549 + ... + 5278055552.

Almost surely, 2^21112222202 is an apocalyptic number.

21112222202 is a deficient number, since it is larger than the sum of its proper divisors (10556111104).

21112222202 is a wasteful number, since it uses less digits than its factorization.

21112222202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556111103.

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

Adding to 21112222202 its reverse (20222221112), we get a palindrome (41334443314).

The spelling of 21112222202 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, two hundred two".