21979599002 has 8 divisors (see below), whose sum is σ = 32970184596. Its totient is φ = 10989537472.

The previous prime is 21979599001. The next prime is 21979599011. The reversal of 21979599002 is 20099597912.

It can be written as a sum of positive squares in 2 ways, for example, as 18208533721 + 3771065281 = 134939^2 + 61409^2 .

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 (21979599001) 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, 68 + ... + 209664.

Almost surely, 2^21979599002 is an apocalyptic number.

21979599002 is a deficient number, since it is larger than the sum of its proper divisors (10990585594).

21979599002 is a wasteful number, since it uses less digits than its factorization.

21979599002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262032.

The product of its (nonzero) digits is 918540, while the sum is 53.

The spelling of 21979599002 in words is "twenty-one billion, nine hundred seventy-nine million, five hundred ninety-nine thousand, two".