1055221 has 4 divisors (see below), whose sum is σ = 1058092. Its totient is φ = 1052352.

The previous prime is 1055191. The next prime is 1055231. The reversal of 1055221 is 1225501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 476100 = 761^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1055221 - 2⁵ = 1055189 is a prime.

It is a super-2 number, since 2×1055221² = 2226982717682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1055195 and 1055204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055231) 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, 786 + ... + 1651.

It is an arithmetic number, because the mean of its divisors is an integer number (264523).

2^1055221 is an apocalyptic number.

It is an amenable number.

1055221 is a deficient number, since it is larger than the sum of its proper divisors (2871).

1055221 is an equidigital number, since it uses as much as digits as its factorization.

1055221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1055221 is about 1027.2395046921. The cubic root of 1055221 is about 101.8078208913.

The spelling of 1055221 in words is "one million, fifty-five thousand, two hundred twenty-one".