221534407472557 has 8 divisors (see below), whose sum is σ = 226259088598656. Its totient is φ = 216810192308832.

The previous prime is 221534407472527. The next prime is 221534407472603. The reversal of 221534407472557 is 755274704435122.

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

It is a cyclic number.

It is not a de Polignac number, because 221534407472557 - 2¹⁵ = 221534407439789 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 (221534407472527) 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, 115529503 + ... + 117431404.

It is an arithmetic number, because the mean of its divisors is an integer number (28282386074832).

Almost surely, 2^{221534407472557} is an apocalyptic number.

It is an amenable number.

221534407472557 is a deficient number, since it is larger than the sum of its proper divisors (4724681126099).

221534407472557 is a wasteful number, since it uses less digits than its factorization.

221534407472557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232981187.

The product of its (nonzero) digits is 65856000, while the sum is 58.

The spelling of 221534407472557 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred seven million, four hundred seventy-two thousand, five hundred fifty-seven".