217235220850 has 24 divisors (see below), whose sum is σ = 407239077888. Its totient is φ = 86209880400.

The previous prime is 217235220841. The next prime is 217235220857. The reversal of 217235220850 is 58022532712.

It is a super-2 number, since 2×217235220850² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (217235220857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17098786 + ... + 17111485.

It is an arithmetic number, because the mean of its divisors is an integer number (16968294912).

Almost surely, 2^217235220850 is an apocalyptic number.

217235220850 is a deficient number, since it is larger than the sum of its proper divisors (190003857038).

217235220850 is a wasteful number, since it uses less digits than its factorization.

217235220850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34210410 (or 34210405 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 217235220850 in words is "two hundred seventeen billion, two hundred thirty-five million, two hundred twenty thousand, eight hundred fifty".