21321322202 has 16 divisors (see below), whose sum is σ = 32359775400. Its totient is φ = 10534867200.

The previous prime is 21321322177. The next prime is 21321322219. The reversal of 21321322202 is 20222312312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15124326361 + 6196995841 = 122981^2 + 78721^2 .

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, 287324 + ... + 353832.

Almost surely, 2^21321322202 is an apocalyptic number.

21321322202 is a deficient number, since it is larger than the sum of its proper divisors (11038453198).

21321322202 is a wasteful number, since it uses less digits than its factorization.

21321322202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68401.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21321322202 its reverse (20222312312), we get a palindrome (41543634514).

The spelling of 21321322202 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty-two thousand, two hundred two".