164355021 has 8 divisors (see below), whose sum is σ = 243488960. Its totient is φ = 109569996.

The previous prime is 164355013. The next prime is 164355029. The reversal of 164355021 is 120553461.

It is an interprime number because it is at equal distance from previous prime (164355013) and next prime (164355029).

It is not a de Polignac number, because 164355021 - 2³ = 164355013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 6087223 = 164355021 / (1 + 6 + 4 + 3 + 5 + 5 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164355029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3043585 + ... + 3043638.

It is an arithmetic number, because the mean of its divisors is an integer number (30436120).

Almost surely, 2^164355021 is an apocalyptic number.

It is an amenable number.

164355021 is a deficient number, since it is larger than the sum of its proper divisors (79133939).

164355021 is an equidigital number, since it uses as much as digits as its factorization.

164355021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087232 (or 6087226 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 164355021 is about 12820.1022226814. The cubic root of 164355021 is about 547.7650583721.

The spelling of 164355021 in words is "one hundred sixty-four million, three hundred fifty-five thousand, twenty-one".