164214621 has 40 divisors (see below), whose sum is σ = 254269400. Its totient is φ = 105535872.

The previous prime is 164214613. The next prime is 164214643. The reversal of 164214621 is 126412461.

164214621 is a `hidden beast` number, since 1 + 642 + 14 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 57836025 + 106378596 = 7605^2 + 10314^2 .

It is not a de Polignac number, because 164214621 - 2³ = 164214613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164214671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 470355 + ... + 470703.

It is an arithmetic number, because the mean of its divisors is an integer number (6356735).

Almost surely, 2^164214621 is an apocalyptic number.

It is an amenable number.

164214621 is a deficient number, since it is larger than the sum of its proper divisors (90054779).

164214621 is a wasteful number, since it uses less digits than its factorization.

164214621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 546 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 164214621 is about 12814.6252773930. The cubic root of 164214621 is about 547.6090381440.

The spelling of 164214621 in words is "one hundred sixty-four million, two hundred fourteen thousand, six hundred twenty-one".