215316979988 has 12 divisors (see below), whose sum is σ = 411059689152. Its totient is φ = 97871354520.

The previous prime is 215316979979. The next prime is 215316979993. The reversal of 215316979988 is 889979613512.

It is a happy number.

It is a super-2 number, since 2×215316979988² (a number of 23 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 3 ways as a sum of consecutive naturals, for example, 2446783820 + ... + 2446783907.

It is an arithmetic number, because the mean of its divisors is an integer number (34254974096).

Almost surely, 2^215316979988 is an apocalyptic number.

It is an amenable number.

215316979988 is a deficient number, since it is larger than the sum of its proper divisors (195742709164).

215316979988 is a wasteful number, since it uses less digits than its factorization.

215316979988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4893567742 (or 4893567740 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 68.

The spelling of 215316979988 in words is "two hundred fifteen billion, three hundred sixteen million, nine hundred seventy-nine thousand, nine hundred eighty-eight".