164220621 has 16 divisors (see below), whose sum is σ = 234057600. Its totient is φ = 102164480.

The previous prime is 164220613. The next prime is 164220643. The reversal of 164220621 is 126022461.

It is a cyclic number.

It is not a de Polignac number, because 164220621 - 2³ = 164220613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164220591 and 164220600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164220611) 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, 26196 + ... + 31853.

It is an arithmetic number, because the mean of its divisors is an integer number (14628600).

Almost surely, 2^164220621 is an apocalyptic number.

It is an amenable number.

164220621 is a deficient number, since it is larger than the sum of its proper divisors (69836979).

164220621 is a wasteful number, since it uses less digits than its factorization.

164220621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58116.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 164220621 is about 12814.8593827634. The cubic root of 164220621 is about 547.6157074938.

The spelling of 164220621 in words is "one hundred sixty-four million, two hundred twenty thousand, six hundred twenty-one".