164573421 has 16 divisors (see below), whose sum is σ = 231920640. Its totient is φ = 103518000.

The previous prime is 164573407. The next prime is 164573449. The reversal of 164573421 is 124375461.

It is not a de Polignac number, because 164573421 - 2⁹ = 164572909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164573491) 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, 8556 + ... + 20058.

It is an arithmetic number, because the mean of its divisors is an integer number (14495040).

Almost surely, 2^164573421 is an apocalyptic number.

It is an amenable number.

164573421 is a deficient number, since it is larger than the sum of its proper divisors (67347219).

164573421 is a wasteful number, since it uses less digits than its factorization.

164573421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11776.

The product of its digits is 20160, while the sum is 33.

The square root of 164573421 is about 12828.6172676559. The cubic root of 164573421 is about 548.0075799918.

The spelling of 164573421 in words is "one hundred sixty-four million, five hundred seventy-three thousand, four hundred twenty-one".