21136645322 has 16 divisors (see below), whose sum is σ = 34147002120. Its totient is φ = 9754463232.

The previous prime is 21136645319. The next prime is 21136645429. The reversal of 21136645322 is 22354663112.

It can be written as a sum of positive squares in 4 ways, for example, as 8779877401 + 12356767921 = 93701^2 + 111161^2 .

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, 303578 + ... + 366650.

Almost surely, 2^21136645322 is an apocalyptic number.

21136645322 is a deficient number, since it is larger than the sum of its proper divisors (13010356798).

21136645322 is a wasteful number, since it uses less digits than its factorization.

21136645322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75977.

The product of its digits is 51840, while the sum is 35.

The spelling of 21136645322 in words is "twenty-one billion, one hundred thirty-six million, six hundred forty-five thousand, three hundred twenty-two".