2133945621 has 16 divisors (see below), whose sum is σ = 3347366400. Its totient is φ = 1338945984.

The previous prime is 2133945617. The next prime is 2133945661. The reversal of 2133945621 is 1265493312.

2133945621 is a `hidden beast` number, since 2 + 1 + 3 + 3 + 94 + 562 + 1 = 666.

It is not a de Polignac number, because 2133945621 - 2² = 2133945617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2133945601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2324101 + ... + 2325018.

It is an arithmetic number, because the mean of its divisors is an integer number (209210400).

Almost surely, 2^2133945621 is an apocalyptic number.

It is an amenable number.

2133945621 is a deficient number, since it is larger than the sum of its proper divisors (1213420779).

2133945621 is a wasteful number, since it uses less digits than its factorization.

2133945621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4649145 (or 4649139 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 2133945621 is about 46194.6492680700. The cubic root of 2133945621 is about 1287.4423254524.

The spelling of 2133945621 in words is "two billion, one hundred thirty-three million, nine hundred forty-five thousand, six hundred twenty-one".