215551242 has 24 divisors (see below), whose sum is σ = 469830816. Its totient is φ = 71419176.

The previous prime is 215551241. The next prime is 215551267. The reversal of 215551242 is 242155512.

It is not an unprimeable number, because it can be changed into a prime (215551241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32848 + ... + 38859.

It is an arithmetic number, because the mean of its divisors is an integer number (19576284).

Almost surely, 2^215551242 is an apocalyptic number.

215551242 is an abundant number, since it is smaller than the sum of its proper divisors (254279574).

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

215551242 is a wasteful number, since it uses less digits than its factorization.

215551242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71882 (or 71879 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 215551242 is about 14681.6634616109. The cubic root of 215551242 is about 599.5841952439.

The spelling of 215551242 in words is "two hundred fifteen million, five hundred fifty-one thousand, two hundred forty-two".