215221452 has 24 divisors (see below), whose sum is σ = 515756976. Its totient is φ = 69801408.

The previous prime is 215221421. The next prime is 215221463. The reversal of 215221452 is 254122512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241923 + ... + 242810.

It is an arithmetic number, because the mean of its divisors is an integer number (21489874).

Almost surely, 2^215221452 is an apocalyptic number.

It is an amenable number.

215221452 is an abundant number, since it is smaller than the sum of its proper divisors (300535524).

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

215221452 is a wasteful number, since it uses less digits than its factorization.

215221452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484777 (or 484775 counting only the distinct ones).

The product of its digits is 1600, while the sum is 24.

The square root of 215221452 is about 14670.4278056231. The cubic root of 215221452 is about 599.2782543758.

Adding to 215221452 its reverse (254122512), we get a palindrome (469343964).

The spelling of 215221452 in words is "two hundred fifteen million, two hundred twenty-one thousand, four hundred fifty-two".