215451242 has 8 divisors (see below), whose sum is σ = 330692736. Its totient is φ = 105220332.

The previous prime is 215451239. The next prime is 215451283. The reversal of 215451242 is 242154512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1252538 + ... + 1252709.

It is an arithmetic number, because the mean of its divisors is an integer number (41336592).

Almost surely, 2^215451242 is an apocalyptic number.

215451242 is a deficient number, since it is larger than the sum of its proper divisors (115241494).

215451242 is a wasteful number, since it uses less digits than its factorization.

215451242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505292.

The product of its digits is 3200, while the sum is 26.

The square root of 215451242 is about 14678.2574578865. The cubic root of 215451242 is about 599.4914598407.

The spelling of 215451242 in words is "two hundred fifteen million, four hundred fifty-one thousand, two hundred forty-two".