164357421 has 16 divisors (see below), whose sum is σ = 223840320. Its totient is φ = 107239680.

The previous prime is 164357419. The next prime is 164357477. The reversal of 164357421 is 124753461.

It is not a de Polignac number, because 164357421 - 2¹ = 164357419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164357521) 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, 40731 + ... + 44583.

It is an arithmetic number, because the mean of its divisors is an integer number (13990020).

Almost surely, 2^164357421 is an apocalyptic number.

It is an amenable number.

164357421 is a deficient number, since it is larger than the sum of its proper divisors (59482899).

164357421 is a wasteful number, since it uses less digits than its factorization.

164357421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156.

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

The square root of 164357421 is about 12820.1958253375. The cubic root of 164357421 is about 547.7677246120.

The spelling of 164357421 in words is "one hundred sixty-four million, three hundred fifty-seven thousand, four hundred twenty-one".