1045664221 has 8 divisors (see below), whose sum is σ = 1257942080. Its totient is φ = 849110688.

The previous prime is 1045664201. The next prime is 1045664227. The reversal of 1045664221 is 1224665401.

It is a happy number.

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 1045664221 - 2⁷ = 1045664093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045664227) 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, 3930936 + ... + 3931201.

It is an arithmetic number, because the mean of its divisors is an integer number (157242760).

Almost surely, 2^1045664221 is an apocalyptic number.

It is an amenable number.

1045664221 is a deficient number, since it is larger than the sum of its proper divisors (212277859).

1045664221 is an equidigital number, since it uses as much as digits as its factorization.

1045664221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7862163.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1045664221 is about 32336.7317612649. The cubic root of 1045664221 is about 1014.9954203972.

The spelling of 1045664221 in words is "one billion, forty-five million, six hundred sixty-four thousand, two hundred twenty-one".