216212910169 has 9 divisors (see below), whose sum is σ = 228200789343. Its totient is φ = 204824913552.

The previous prime is 216212910103. The next prime is 216212910181. The reversal of 216212910169 is 961019212612.

The square root of 216212910169 is 464987.

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., 170540091225 + 45672818944 = 412965^2 + 213712^2 .

It is not a de Polignac number, because 216212910169 - 2²⁵ = 216179355737 is a prime.

It is a super-2 number, since 2×216212910169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216212980169) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8822517 + ... + 8846989.

Almost surely, 2^216212910169 is an apocalyptic number.

216212910169 is the 464987-th square number.

216212910169 is the 232494-th centered octagonal number.

It is an amenable number.

216212910169 is a deficient number, since it is larger than the sum of its proper divisors (11987879174).

216212910169 is an frugal number, since it uses more digits than its factorization.

216212910169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48984 (or 24492 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 216212910169 in words is "two hundred sixteen billion, two hundred twelve million, nine hundred ten thousand, one hundred sixty-nine".