64146221 has 4 divisors (see below), whose sum is σ = 64239744. Its totient is φ = 64052700.

The previous prime is 64146193. The next prime is 64146227. The reversal of 64146221 is 12264146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64146221 is a prime.

It is a super-2 number, since 2×64146221² = 8229475337161682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64146227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45725 + ... + 47106.

It is an arithmetic number, because the mean of its divisors is an integer number (16059936).

Almost surely, 2^64146221 is an apocalyptic number.

It is an amenable number.

64146221 is a deficient number, since it is larger than the sum of its proper divisors (93523).

64146221 is an equidigital number, since it uses as much as digits as its factorization.

64146221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93522.

The product of its digits is 2304, while the sum is 26.

The square root of 64146221 is about 8009.1335985861. The cubic root of 64146221 is about 400.3043953832.

The spelling of 64146221 in words is "sixty-four million, one hundred forty-six thousand, two hundred twenty-one".