21003015336 has 16 divisors (see below), whose sum is σ = 52507538400. Its totient is φ = 7001005104.

The previous prime is 21003015329. The next prime is 21003015389. The reversal of 21003015336 is 63351030012.

It is a happy number.

It is a super-2 number, since 2×21003015336² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 875125639 = 21003015336 / (2 + 1 + 0 + 0 + 3 + 0 + 1 + 5 + 3 + 3 + 6).

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, 437562796 + ... + 437562843.

It is an arithmetic number, because the mean of its divisors is an integer number (3281721150).

Almost surely, 2^21003015336 is an apocalyptic number.

It is an amenable number.

21003015336 is an abundant number, since it is smaller than the sum of its proper divisors (31504523064).

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

21003015336 is a wasteful number, since it uses less digits than its factorization.

21003015336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875125648 (or 875125644 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

Adding to 21003015336 its reverse (63351030012), we get a palindrome (84354045348).

The spelling of 21003015336 in words is "twenty-one billion, three million, fifteen thousand, three hundred thirty-six".