164045021 has 8 divisors (see below), whose sum is σ = 187561920. Its totient is φ = 140548608.

The previous prime is 164044981. The next prime is 164045023. The reversal of 164045021 is 120540461.

164045021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164045021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164045023) 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, 20810 + ... + 27588.

It is an arithmetic number, because the mean of its divisors is an integer number (23445240).

Almost surely, 2^164045021 is an apocalyptic number.

It is an amenable number.

164045021 is a deficient number, since it is larger than the sum of its proper divisors (23516899).

164045021 is an equidigital number, since it uses as much as digits as its factorization.

164045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10243.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 164045021 is about 12808.0061289804. The cubic root of 164045021 is about 547.4204506235.

Adding to 164045021 its reverse (120540461), we get a palindrome (284585482).

The spelling of 164045021 in words is "one hundred sixty-four million, forty-five thousand, twenty-one".