21313222002 has 24 divisors (see below), whose sum is σ = 46935677100. Its totient is φ = 6987941280.

The previous prime is 21313221991. The next prime is 21313222019. The reversal of 21313222002 is 20022231312.

It can be written as a sum of positive squares in 2 ways, for example, as 18316644921 + 2996577081 = 135339^2 + 54741^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9704377 + ... + 9706572.

Almost surely, 2^21313222002 is an apocalyptic number.

21313222002 is an abundant number, since it is smaller than the sum of its proper divisors (25622455098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21313222002 is a wasteful number, since it uses less digits than its factorization.

21313222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19411018 (or 19411015 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21313222002 its reverse (20022231312), we get a palindrome (41335453314).

The spelling of 21313222002 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty-two thousand, two".