216971503204 has 9 divisors (see below), whose sum is σ = 379701760921. Its totient is φ = 108485285800.

The previous prime is 216971503153. The next prime is 216971503213. The reversal of 216971503204 is 402305179612.

It is a happy number.

The square root of 216971503204 is 465802.

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

It can be written as a sum of positive squares in only one way, i.e., 8780064804 + 208191438400 = 93702^2 + 456280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 815154 + ... + 1048054.

Almost surely, 2^216971503204 is an apocalyptic number.

216971503204 is the 465802-nd square number.

It is an amenable number.

216971503204 is a deficient number, since it is larger than the sum of its proper divisors (162730257717).

216971503204 is an frugal number, since it uses more digits than its factorization.

216971503204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465806 (or 232903 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 216971503204 in words is "two hundred sixteen billion, nine hundred seventy-one million, five hundred three thousand, two hundred four".