215220432 has 80 divisors (see below), whose sum is σ = 637117952. Its totient is φ = 61326720.

The previous prime is 215220431. The next prime is 215220433. The reversal of 215220432 is 234022512.

It is an interprime number because it is at equal distance from previous prime (215220431) and next prime (215220433).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 215220399 and 215220408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215220431) 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, 183207 + ... + 184377.

Almost surely, 2^215220432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215220432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318558976).

215220432 is an abundant number, since it is smaller than the sum of its proper divisors (421897520).

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

215220432 is a wasteful number, since it uses less digits than its factorization.

215220432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 215220432 is about 14670.3930417695. The cubic root of 215220432 is about 599.2773076536.

Adding to 215220432 its reverse (234022512), we get a palindrome (449242944).

The spelling of 215220432 in words is "two hundred fifteen million, two hundred twenty thousand, four hundred thirty-two".