215131909996 has 48 divisors (see below), whose sum is σ = 401269710240. Its totient is φ = 100737620480.

The previous prime is 215131909991. The next prime is 215131909999. The reversal of 215131909996 is 699909131512.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (215131909991) 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, 692055 + ... + 953521.

It is an arithmetic number, because the mean of its divisors is an integer number (8359785630).

Almost surely, 2^215131909996 is an apocalyptic number.

It is an amenable number.

215131909996 is a deficient number, since it is larger than the sum of its proper divisors (186137800244).

215131909996 is a wasteful number, since it uses less digits than its factorization.

215131909996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261714 (or 261712 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 55.

The spelling of 215131909996 in words is "two hundred fifteen billion, one hundred thirty-one million, nine hundred nine thousand, nine hundred ninety-six".