1055565221 has 4 divisors (see below), whose sum is σ = 1089615744. Its totient is φ = 1021514700.

The previous prime is 1055565163. The next prime is 1055565223. The reversal of 1055565221 is 1225655501.

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 not a de Polignac number, because 1055565221 - 2⁶ = 1055565157 is a prime.

It is a super-2 number, since 2×1055565221² = 2228435871569557682, 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 (1055565223) 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, 17025215 + ... + 17025276.

It is an arithmetic number, because the mean of its divisors is an integer number (272403936).

Almost surely, 2^1055565221 is an apocalyptic number.

It is an amenable number.

1055565221 is a deficient number, since it is larger than the sum of its proper divisors (34050523).

1055565221 is an equidigital number, since it uses as much as digits as its factorization.

1055565221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34050522.

The product of its (nonzero) digits is 15000, while the sum is 32.

The square root of 1055565221 is about 32489.4632304075. The cubic root of 1055565221 is about 1018.1888984586.

The spelling of 1055565221 in words is "one billion, fifty-five million, five hundred sixty-five thousand, two hundred twenty-one".