216426442 has 4 divisors (see below), whose sum is σ = 324639666. Its totient is φ = 108213220.

The previous prime is 216426421. The next prime is 216426451. The reversal of 216426442 is 244624612.

It is a happy number.

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., 118831801 + 97594641 = 10901^2 + 9879^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54106609 + ... + 54106612.

Almost surely, 2^216426442 is an apocalyptic number.

216426442 is a deficient number, since it is larger than the sum of its proper divisors (108213224).

216426442 is a wasteful number, since it uses less digits than its factorization.

216426442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108213223.

The product of its digits is 18432, while the sum is 31.

The square root of 216426442 is about 14711.4391546171. The cubic root of 216426442 is about 600.3945941393.

The spelling of 216426442 in words is "two hundred sixteen million, four hundred twenty-six thousand, four hundred forty-two".