21326643322 has 4 divisors (see below), whose sum is σ = 31989964986. Its totient is φ = 10663321660.

The previous prime is 21326643281. The next prime is 21326643323. The reversal of 21326643322 is 22334662312.

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., 21298775481 + 27867841 = 145941^2 + 5279^2 .

It is not an unprimeable number, because it can be changed into a prime (21326643323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331660829 + ... + 5331660832.

Almost surely, 2^21326643322 is an apocalyptic number.

21326643322 is a deficient number, since it is larger than the sum of its proper divisors (10663321664).

21326643322 is a wasteful number, since it uses less digits than its factorization.

21326643322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663321663.

The product of its digits is 62208, while the sum is 34.

The spelling of 21326643322 in words is "twenty-one billion, three hundred twenty-six million, six hundred forty-three thousand, three hundred twenty-two".