221352255257 has 8 divisors (see below), whose sum is σ = 253242848832. Its totient is φ = 189528872400.

The previous prime is 221352255253. The next prime is 221352255259. The reversal of 221352255257 is 752552253122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221352255257 - 2² = 221352255253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221352255253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16795619 + ... + 16808792.

It is an arithmetic number, because the mean of its divisors is an integer number (31655356104).

Almost surely, 2^221352255257 is an apocalyptic number.

It is an amenable number.

221352255257 is a deficient number, since it is larger than the sum of its proper divisors (31890593575).

221352255257 is an equidigital number, since it uses as much as digits as its factorization.

221352255257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33605359.

The product of its digits is 420000, while the sum is 41.

The spelling of 221352255257 in words is "two hundred twenty-one billion, three hundred fifty-two million, two hundred fifty-five thousand, two hundred fifty-seven".