1053666221 has 4 divisors (see below), whose sum is σ = 1053960672. Its totient is φ = 1053371772.

The previous prime is 1053666203. The next prime is 1053666253. The reversal of 1053666221 is 1226663501.

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-1053666221 is a prime.

It is a super-2 number, since 2×1053666221² = 2220425010552841682, 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 (1053666121) 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, 141791 + ... + 149036.

It is an arithmetic number, because the mean of its divisors is an integer number (263490168).

Almost surely, 2^1053666221 is an apocalyptic number.

It is an amenable number.

1053666221 is a deficient number, since it is larger than the sum of its proper divisors (294451).

1053666221 is an equidigital number, since it uses as much as digits as its factorization.

1053666221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294450.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1053666221 is about 32460.2252148687. The cubic root of 1053666221 is about 1017.5779457218.

The spelling of 1053666221 in words is "one billion, fifty-three million, six hundred sixty-six thousand, two hundred twenty-one".