21003162604 has 12 divisors (see below), whose sum is σ = 36815498944. Its totient is φ = 10484448624.

The previous prime is 21003162589. The next prime is 21003162637. The reversal of 21003162604 is 40626130012.

It is a super-2 number, since 2×21003162604² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4280412 + ... + 4285315.

Almost surely, 2^21003162604 is an apocalyptic number.

It is an amenable number.

21003162604 is a deficient number, since it is larger than the sum of its proper divisors (15812336340).

21003162604 is a wasteful number, since it uses less digits than its factorization.

21003162604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8566344 (or 8566342 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21003162604 its reverse (40626130012), we get a palindrome (61629292616).

The spelling of 21003162604 in words is "twenty-one billion, three million, one hundred sixty-two thousand, six hundred four".