21662128322 has 8 divisors (see below), whose sum is σ = 32497426236. Its totient is φ = 10829652912.

The previous prime is 21662128321. The next prime is 21662128333. The reversal of 21662128322 is 22382126612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21649885321 + 12243001 = 147139^2 + 3499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21662128321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686333 + ... + 717200.

Almost surely, 2^21662128322 is an apocalyptic number.

21662128322 is a deficient number, since it is larger than the sum of its proper divisors (10835297914).

21662128322 is a wasteful number, since it uses less digits than its factorization.

21662128322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411252.

The product of its digits is 27648, while the sum is 35.

The spelling of 21662128322 in words is "twenty-one billion, six hundred sixty-two million, one hundred twenty-eight thousand, three hundred twenty-two".