216891442 has 8 divisors (see below), whose sum is σ = 325501056. Its totient is φ = 108391092.

The previous prime is 216891427. The next prime is 216891443. The reversal of 216891442 is 244198612.

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

It is a super-2 number, since 2×216891442² = 94083795225678728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216891443) 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, 22158 + ... + 30409.

It is an arithmetic number, because the mean of its divisors is an integer number (40687632).

Almost surely, 2^216891442 is an apocalyptic number.

216891442 is a deficient number, since it is larger than the sum of its proper divisors (108609614).

216891442 is a wasteful number, since it uses less digits than its factorization.

216891442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54632.

The product of its digits is 27648, while the sum is 37.

The square root of 216891442 is about 14727.2347030934. The cubic root of 216891442 is about 600.8242763549.

The spelling of 216891442 in words is "two hundred sixteen million, eight hundred ninety-one thousand, four hundred forty-two".