215213340 has 24 divisors (see below), whose sum is σ = 602597520. Its totient is φ = 57390208.

The previous prime is 215213281. The next prime is 215213351. The reversal of 215213340 is 43312512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1793385 + ... + 1793504.

It is an arithmetic number, because the mean of its divisors is an integer number (25108230).

Almost surely, 2^215213340 is an apocalyptic number.

215213340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215213340 is an abundant number, since it is smaller than the sum of its proper divisors (387384180).

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

215213340 is a wasteful number, since it uses less digits than its factorization.

215213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586901 (or 3586899 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 215213340 is about 14670.1513284628. The cubic root of 215213340 is about 599.2707250670.

Adding to 215213340 its reverse (43312512), we get a palindrome (258525852).

The spelling of 215213340 in words is "two hundred fifteen million, two hundred thirteen thousand, three hundred forty".