215422442 has 4 divisors (see below), whose sum is σ = 323133666. Its totient is φ = 107711220.

The previous prime is 215422421. The next prime is 215422447. The reversal of 215422442 is 244224512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 198274561 + 17147881 = 14081^2 + 4141^2 .

It is not an unprimeable number, because it can be changed into a prime (215422447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53855609 + ... + 53855612.

Almost surely, 2^215422442 is an apocalyptic number.

215422442 is a deficient number, since it is larger than the sum of its proper divisors (107711224).

215422442 is a wasteful number, since it uses less digits than its factorization.

215422442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107711223.

The product of its digits is 5120, while the sum is 26.

The square root of 215422442 is about 14677.2763822175. The cubic root of 215422442 is about 599.4647467226.

Adding to 215422442 its reverse (244224512), we get a palindrome (459646954).

The spelling of 215422442 in words is "two hundred fifteen million, four hundred twenty-two thousand, four hundred forty-two".