217231390488 has 32 divisors (see below), whose sum is σ = 620661116160. Its totient is φ = 62066111520.

The previous prime is 217231390469. The next prime is 217231390489. The reversal of 217231390488 is 884093132712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217231390489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646521828 + ... + 646522163.

It is an arithmetic number, because the mean of its divisors is an integer number (19395659880).

Almost surely, 2^217231390488 is an apocalyptic number.

217231390488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

217231390488 is an abundant number, since it is smaller than the sum of its proper divisors (403429725672).

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

217231390488 is a wasteful number, since it uses less digits than its factorization.

217231390488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293044007 (or 1293044003 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 217231390488 in words is "two hundred seventeen billion, two hundred thirty-one million, three hundred ninety thousand, four hundred eighty-eight".