216524221245 has 48 divisors (see below), whose sum is σ = 388871383680. Its totient is φ = 111380300928.

The previous prime is 216524221237. The next prime is 216524221273. The reversal of 216524221245 is 542122425612.

216524221245 is a `hidden beast` number, since 2 + 1 + 6 + 524 + 2 + 2 + 124 + 5 = 666.

It is not a de Polignac number, because 216524221245 - 2³ = 216524221237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 628657 + ... + 910086.

It is an arithmetic number, because the mean of its divisors is an integer number (8101487160).

Almost surely, 2^216524221245 is an apocalyptic number.

It is an amenable number.

216524221245 is a deficient number, since it is larger than the sum of its proper divisors (172347162435).

216524221245 is a wasteful number, since it uses less digits than its factorization.

216524221245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538866 (or 1538863 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

Adding to 216524221245 its reverse (542122425612), we get a palindrome (758646646857).

The spelling of 216524221245 in words is "two hundred sixteen billion, five hundred twenty-four million, two hundred twenty-one thousand, two hundred forty-five".