21246555315 has 16 divisors (see below), whose sum is σ = 33996354048. Its totient is φ = 11330874336.

The previous prime is 21246555311. The next prime is 21246555353. The reversal of 21246555315 is 51355564212.

It is not a de Polignac number, because 21246555315 - 2² = 21246555311 is a prime.

It is a super-2 number, since 2×21246555315² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21246555311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413224 + ... + 461786.

It is an arithmetic number, because the mean of its divisors is an integer number (2124772128).

Almost surely, 2^21246555315 is an apocalyptic number.

21246555315 is a deficient number, since it is larger than the sum of its proper divisors (12749798733).

21246555315 is a wasteful number, since it uses less digits than its factorization.

21246555315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77738.

The product of its digits is 180000, while the sum is 39.

The spelling of 21246555315 in words is "twenty-one billion, two hundred forty-six million, five hundred fifty-five thousand, three hundred fifteen".