164364021 has 6 divisors (see below), whose sum is σ = 237414710. Its totient is φ = 109576008.

The previous prime is 164363989. The next prime is 164364023. The reversal of 164364021 is 120463461.

164364021 is a `hidden beast` number, since 16 + 4 + 3 + 640 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 159138225 + 5225796 = 12615^2 + 2286^2 .

It is not a de Polignac number, because 164364021 - 2⁵ = 164363989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164364023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9131326 + ... + 9131343.

Almost surely, 2^164364021 is an apocalyptic number.

It is an amenable number.

164364021 is a deficient number, since it is larger than the sum of its proper divisors (73050689).

164364021 is a wasteful number, since it uses less digits than its factorization.

164364021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18262675 (or 18262672 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 164364021 is about 12820.4532291179. The cubic root of 164364021 is about 547.7750566379.

The spelling of 164364021 in words is "one hundred sixty-four million, three hundred sixty-four thousand, twenty-one".