221657017223 has 4 divisors (see below), whose sum is σ = 225413915880. Its totient is φ = 217900118568.

The previous prime is 221657017201. The next prime is 221657017249. The reversal of 221657017223 is 322710756122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221657017223 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 (221657014223) 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, 1878449240 + ... + 1878449357.

It is an arithmetic number, because the mean of its divisors is an integer number (56353478970).

Almost surely, 2^221657017223 is an apocalyptic number.

221657017223 is a deficient number, since it is larger than the sum of its proper divisors (3756898657).

221657017223 is an equidigital number, since it uses as much as digits as its factorization.

221657017223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3756898656.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 221657017223 in words is "two hundred twenty-one billion, six hundred fifty-seven million, seventeen thousand, two hundred twenty-three".