221421255243427 has 4 divisors (see below), whose sum is σ = 226570586760760. Its totient is φ = 216271923726096.

The previous prime is 221421255243389. The next prime is 221421255243437. The reversal of 221421255243427 is 724342552124122.

221421255243427 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 a de Polignac number, because none of the positive numbers 2^k-221421255243427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221421255243437) 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, 2574665758602 + ... + 2574665758687.

It is an arithmetic number, because the mean of its divisors is an integer number (56642646690190).

Almost surely, 2^{221421255243427} is an apocalyptic number.

221421255243427 is a deficient number, since it is larger than the sum of its proper divisors (5149331517333).

221421255243427 is an equidigital number, since it uses as much as digits as its factorization.

221421255243427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5149331517332.

The product of its digits is 2150400, while the sum is 46.

The spelling of 221421255243427 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred forty-three thousand, four hundred twenty-seven".