21204103315 has 8 divisors (see below), whose sum is σ = 26941684320. Its totient is φ = 15965442432.

The previous prime is 21204103273. The next prime is 21204103339. The reversal of 21204103315 is 51330140212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21204103315 - 2⁷ = 21204103187 is a prime.

It is a super-2 number, since 2×21204103315² (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 7 ways as a sum of consecutive naturals, for example, 124729935 + ... + 124730104.

It is an arithmetic number, because the mean of its divisors is an integer number (3367710540).

Almost surely, 2^21204103315 is an apocalyptic number.

21204103315 is a deficient number, since it is larger than the sum of its proper divisors (5737581005).

21204103315 is a wasteful number, since it uses less digits than its factorization.

21204103315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249460061.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21204103315 its reverse (51330140212), we get a palindrome (72534243527).

The spelling of 21204103315 in words is "twenty-one billion, two hundred four million, one hundred three thousand, three hundred fifteen".