21000023002 has 24 divisors (see below), whose sum is σ = 36703970100. Its totient is φ = 8985009600.

The previous prime is 21000022999. The next prime is 21000023021. The reversal of 21000023002 is 20032000012.

It can be written as a sum of positive squares in 2 ways, for example, as 16819236721 + 4180786281 = 129689^2 + 64659^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21000023002.

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, 119377 + ... + 237172.

Almost surely, 2^21000023002 is an apocalyptic number.

21000023002 is a deficient number, since it is larger than the sum of its proper divisors (15703947098).

21000023002 is a wasteful number, since it uses less digits than its factorization.

21000023002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357166 (or 357159 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21000023002 its reverse (20032000012), we get a palindrome (41032023014).

The spelling of 21000023002 in words is "twenty-one billion, twenty-three thousand, two".