215121132 has 36 divisors (see below), whose sum is σ = 544297936. Its totient is φ = 71638560.

The previous prime is 215121107. The next prime is 215121133. The reversal of 215121132 is 231121512.

215121132 is a `hidden beast` number, since 21 + 512 + 1 + 132 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×215121132² = 92554202865922848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (215121133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47553 + ... + 51879.

Almost surely, 2^215121132 is an apocalyptic number.

It is an amenable number.

215121132 is an abundant number, since it is smaller than the sum of its proper divisors (329176804).

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

215121132 is a wasteful number, since it uses less digits than its factorization.

215121132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718 (or 5713 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 215121132 is about 14667.0082839003. The cubic root of 215121132 is about 599.1851271380.

Adding to 215121132 its reverse (231121512), we get a palindrome (446242644).

The spelling of 215121132 in words is "two hundred fifteen million, one hundred twenty-one thousand, one hundred thirty-two".