21221022202 has 16 divisors (see below), whose sum is σ = 31897348200. Its totient is φ = 10588596480.

The previous prime is 21221022167. The next prime is 21221022239. The reversal of 21221022202 is 20222012212.

It can be written as a sum of positive squares in 4 ways, for example, as 21114705481 + 106316721 = 145309^2 + 10311^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2185374 + ... + 2195062.

Almost surely, 2^21221022202 is an apocalyptic number.

21221022202 is a deficient number, since it is larger than the sum of its proper divisors (10676325998).

21221022202 is a wasteful number, since it uses less digits than its factorization.

21221022202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11841.

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

Adding to 21221022202 its reverse (20222012212), we get a palindrome (41443034414).

The spelling of 21221022202 in words is "twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred two".