216394293124 has 9 divisors (see below), whose sum is σ = 378691641111. Its totient is φ = 108196681380.

The previous prime is 216394293091. The next prime is 216394293127. The reversal of 216394293124 is 421392493612.

It is a happy number.

The square root of 216394293124 is 465182.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216394293127) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 814069 + ... + 1046659.

Almost surely, 2^216394293124 is an apocalyptic number.

216394293124 is the 465182-nd square number.

It is an amenable number.

216394293124 is a deficient number, since it is larger than the sum of its proper divisors (162297347987).

216394293124 is an frugal number, since it uses more digits than its factorization.

216394293124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465186 (or 232593 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The spelling of 216394293124 in words is "two hundred sixteen billion, three hundred ninety-four million, two hundred ninety-three thousand, one hundred twenty-four".