215133138 has 32 divisors (see below), whose sum is σ = 521536320. Its totient is φ = 65191680.

The previous prime is 215133137. The next prime is 215133151. The reversal of 215133138 is 831331512.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (215133137) 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, 180495 + ... + 181682.

It is an arithmetic number, because the mean of its divisors is an integer number (16298010).

Almost surely, 2^215133138 is an apocalyptic number.

215133138 is an abundant number, since it is smaller than the sum of its proper divisors (306403182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215133138 is a wasteful number, since it uses less digits than its factorization.

215133138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362199 (or 362193 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 215133138 is about 14667.4175641113. The cubic root of 215133138 is about 599.1962738545.

The spelling of 215133138 in words is "two hundred fifteen million, one hundred thirty-three thousand, one hundred thirty-eight".