221253553 has 4 divisors (see below), whose sum is σ = 221311728. Its totient is φ = 221195380.

The previous prime is 221253547. The next prime is 221253563. The reversal of 221253553 is 355352122.

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 221253553 - 2¹⁷ = 221122481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221253523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22951 + ... + 31132.

It is an arithmetic number, because the mean of its divisors is an integer number (55327932).

Almost surely, 2^221253553 is an apocalyptic number.

It is an amenable number.

221253553 is a deficient number, since it is larger than the sum of its proper divisors (58175).

221253553 is an equidigital number, since it uses as much as digits as its factorization.

221253553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58174.

The product of its digits is 9000, while the sum is 28.

The square root of 221253553 is about 14874.5942129525. The cubic root of 221253553 is about 604.8254879954.

The spelling of 221253553 in words is "two hundred twenty-one million, two hundred fifty-three thousand, five hundred fifty-three".