221772551215247 has 4 divisors (see below), whose sum is σ = 222177985495896. Its totient is φ = 221367116934600.

The previous prime is 221772551215207. The next prime is 221772551215249. The reversal of 221772551215247 is 742512155277122.

221772551215247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 221772551215247 - 2¹⁶ = 221772551149711 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 (221772551215249) 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, 202717139504 + ... + 202717140597.

It is an arithmetic number, because the mean of its divisors is an integer number (55544496373974).

Almost surely, 2^{221772551215247} is an apocalyptic number.

221772551215247 is a deficient number, since it is larger than the sum of its proper divisors (405434280649).

221772551215247 is an equidigital number, since it uses as much as digits as its factorization.

221772551215247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405434280648.

The product of its digits is 5488000, while the sum is 53.

The spelling of 221772551215247 in words is "two hundred twenty-one trillion, seven hundred seventy-two billion, five hundred fifty-one million, two hundred fifteen thousand, two hundred forty-seven".