215242120 has 16 divisors (see below), whose sum is σ = 484294860. Its totient is φ = 86096832.

The previous prime is 215242043. The next prime is 215242121. The reversal of 215242120 is 21242512.

It can be written as a sum of positive squares in 2 ways, for example, as 181764324 + 33477796 = 13482^2 + 5786^2 .

It is a super-3 number, since 3×215242120³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (215242121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2690487 + ... + 2690566.

Almost surely, 2^215242120 is an apocalyptic number.

215242120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215242120 is an abundant number, since it is smaller than the sum of its proper divisors (269052740).

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

215242120 is a wasteful number, since it uses less digits than its factorization.

215242120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5381064 (or 5381060 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 215242120 is about 14671.1321989818. The cubic root of 215242120 is about 599.2974369222.

Adding to 215242120 its reverse (21242512), we get a palindrome (236484632).

The spelling of 215242120 in words is "two hundred fifteen million, two hundred forty-two thousand, one hundred twenty".