2161218716 has 12 divisors (see below), whose sum is σ = 3785290320. Its totient is φ = 1079707200.

The previous prime is 2161218679. The next prime is 2161218727. The reversal of 2161218716 is 6178121612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220136 + ... + 229743.

It is an arithmetic number, because the mean of its divisors is an integer number (315440860).

Almost surely, 2^2161218716 is an apocalyptic number.

It is an amenable number.

2161218716 is a deficient number, since it is larger than the sum of its proper divisors (1624071604).

2161218716 is a wasteful number, since it uses less digits than its factorization.

2161218716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451084 (or 451082 counting only the distinct ones).

The product of its digits is 8064, while the sum is 35.

The square root of 2161218716 is about 46488.9096021836. The cubic root of 2161218716 is about 1292.9038834977.

The spelling of 2161218716 in words is "two billion, one hundred sixty-one million, two hundred eighteen thousand, seven hundred sixteen".