21537030002 has 8 divisors (see below), whose sum is σ = 32330456796. Its totient is φ = 10760211072.

The previous prime is 21537030001. The next prime is 21537030049. The reversal of 21537030002 is 20003073512.

It can be written as a sum of positive squares in 2 ways, for example, as 13492913281 + 8044116721 = 116159^2 + 89689^2 .

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

It is a super-2 number, since 2×21537030002² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21537030002.

It is not an unprimeable number, because it can be changed into a prime (21537030001) 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, 4148723 + ... + 4153910.

Almost surely, 2^21537030002 is an apocalyptic number.

21537030002 is a deficient number, since it is larger than the sum of its proper divisors (10793426794).

21537030002 is a wasteful number, since it uses less digits than its factorization.

21537030002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8303932.

The product of its (nonzero) digits is 1260, while the sum is 23.

Adding to 21537030002 its sum of digits (23), we get a square (21537030025 = 146755²).

The spelling of 21537030002 in words is "twenty-one billion, five hundred thirty-seven million, thirty thousand, two".