15321420215 has 16 divisors (see below), whose sum is σ = 19846641600. Its totient is φ = 11319931392.

The previous prime is 15321420199. The next prime is 15321420229. The reversal of 15321420215 is 51202412351.

It is a cyclic number.

It is not a de Polignac number, because 15321420215 - 2⁴ = 15321420199 is a prime.

It is a super-2 number, since 2×15321420215² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293730 + ... + 2300399.

It is an arithmetic number, because the mean of its divisors is an integer number (1240415100).

Almost surely, 2^15321420215 is an apocalyptic number.

15321420215 is a deficient number, since it is larger than the sum of its proper divisors (4525221385).

15321420215 is a wasteful number, since it uses less digits than its factorization.

15321420215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594186.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 15321420215 its reverse (51202412351), we get a palindrome (66523832566).

The spelling of 15321420215 in words is "fifteen billion, three hundred twenty-one million, four hundred twenty thousand, two hundred fifteen".