217232215542 has 12 divisors (see below), whose sum is σ = 470669800380. Its totient is φ = 72410738508.

The previous prime is 217232215517. The next prime is 217232215549. The reversal of 217232215542 is 245512232712.

217232215542 is a `hidden beast` number, since 2 + 1 + 72 + 32 + 2 + 1 + 554 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 217232215497 and 217232215506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217232215549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6034228192 + ... + 6034228227.

It is an arithmetic number, because the mean of its divisors is an integer number (39222483365).

Almost surely, 2^217232215542 is an apocalyptic number.

217232215542 is an abundant number, since it is smaller than the sum of its proper divisors (253437584838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217232215542 is a wasteful number, since it uses less digits than its factorization.

217232215542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12068456427 (or 12068456424 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The spelling of 217232215542 in words is "two hundred seventeen billion, two hundred thirty-two million, two hundred fifteen thousand, five hundred forty-two".