221647721227257 has 8 divisors (see below), whose sum is σ = 318263394582784. Its totient is φ = 136398597678288.

The previous prime is 221647721227223. The next prime is 221647721227259. The reversal of 221647721227257 is 752722127746122.

221647721227257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 221647721227257 - 2⁸ = 221647721227001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221647721227197 and 221647721227206.

It is not an unprimeable number, because it can be changed into a prime (221647721227259) 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, 2841637451593 + ... + 2841637451670.

It is an arithmetic number, because the mean of its divisors is an integer number (39782924322848).

Almost surely, 2^{221647721227257} is an apocalyptic number.

It is an amenable number.

221647721227257 is a deficient number, since it is larger than the sum of its proper divisors (96615673355527).

221647721227257 is a wasteful number, since it uses less digits than its factorization.

221647721227257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683274903279.

The product of its digits is 18439680, while the sum is 57.

The spelling of 221647721227257 in words is "two hundred twenty-one trillion, six hundred forty-seven billion, seven hundred twenty-one million, two hundred twenty-seven thousand, two hundred fifty-seven".