64161021 has 8 divisors (see below), whose sum is σ = 88498080. Its totient is φ = 41298992.

The previous prime is 64161017. The next prime is 64161037. The reversal of 64161021 is 12016146.

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

It is a cyclic number.

It is not a de Polignac number, because 64161021 - 2² = 64161017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64161001) 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, 368655 + ... + 368828.

It is an arithmetic number, because the mean of its divisors is an integer number (11062260).

Almost surely, 2^64161021 is an apocalyptic number.

It is an amenable number.

64161021 is a deficient number, since it is larger than the sum of its proper divisors (24337059).

64161021 is a wasteful number, since it uses less digits than its factorization.

64161021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737515.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 64161021 is about 8010.0574904304. The cubic root of 64161021 is about 400.3351794750.

Adding to 64161021 its reverse (12016146), we get a palindrome (76177167).

The spelling of 64161021 in words is "sixty-four million, one hundred sixty-one thousand, twenty-one".