215421132 has 24 divisors (see below), whose sum is σ = 505431472. Its totient is φ = 71409600.

The previous prime is 215421121. The next prime is 215421133. The reversal of 215421132 is 231124512.

It is a super-2 number, since 2×215421132² = 92812528224322848, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215421099 and 215421108.

It is not an unprimeable number, because it can be changed into a prime (215421133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47419 + ... + 51762.

Almost surely, 2^215421132 is an apocalyptic number.

It is an amenable number.

215421132 is an abundant number, since it is smaller than the sum of its proper divisors (290010340).

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

215421132 is a wasteful number, since it uses less digits than its factorization.

215421132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99369 (or 99367 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 215421132 is about 14677.2317553413. The cubic root of 215421132 is about 599.4635315901.

Adding to 215421132 its reverse (231124512), we get a palindrome (446545644).

The spelling of 215421132 in words is "two hundred fifteen million, four hundred twenty-one thousand, one hundred thirty-two".