221256053 has 4 divisors (see below), whose sum is σ = 222072768. Its totient is φ = 220439340.

The previous prime is 221256023. The next prime is 221256059. The reversal of 221256053 is 350652122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 350652122 = 2 ⋅175326061.

It is a cyclic number.

It is not a de Polignac number, because 221256053 - 2⁶ = 221255989 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 (221256059) 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, 407951 + ... + 408492.

It is an arithmetic number, because the mean of its divisors is an integer number (55518192).

Almost surely, 2^221256053 is an apocalyptic number.

It is an amenable number.

221256053 is a deficient number, since it is larger than the sum of its proper divisors (816715).

221256053 is an equidigital number, since it uses as much as digits as its factorization.

221256053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816714.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 221256053 is about 14874.6782486210. The cubic root of 221256053 is about 604.8277660123.

The spelling of 221256053 in words is "two hundred twenty-one million, two hundred fifty-six thousand, fifty-three".