216121144 has 16 divisors (see below), whose sum is σ = 416179800. Its totient is φ = 105139872.

The previous prime is 216121123. The next prime is 216121159. The reversal of 216121144 is 441121612.

It is a congruent number.

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, 364774 + ... + 365365.

Almost surely, 2^216121144 is an apocalyptic number.

It is an amenable number.

216121144 is a deficient number, since it is larger than the sum of its proper divisors (200058656).

216121144 is a wasteful number, since it uses less digits than its factorization.

216121144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730182 (or 730178 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 216121144 is about 14701.0592815620. The cubic root of 216121144 is about 600.1121494066.

Adding to 216121144 its reverse (441121612), we get a palindrome (657242756).

The spelling of 216121144 in words is "two hundred sixteen million, one hundred twenty-one thousand, one hundred forty-four".