2151909216 has 72 divisors (see below), whose sum is σ = 6210883224. Its totient is φ = 706590720.

The previous prime is 2151909167. The next prime is 2151909259. The reversal of 2151909216 is 6129091512.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36465 + ... + 75056.

It is an arithmetic number, because the mean of its divisors is an integer number (86262267).

Almost surely, 2^2151909216 is an apocalyptic number.

It is an amenable number.

2151909216 is an abundant number, since it is smaller than the sum of its proper divisors (4058974008).

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

2151909216 is a wasteful number, since it uses less digits than its factorization.

2151909216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111604 (or 111593 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 2151909216 is about 46388.6755146124. The cubic root of 2151909216 is about 1291.0448070595.

The spelling of 2151909216 in words is "two billion, one hundred fifty-one million, nine hundred nine thousand, two hundred sixteen".