221272747 has 2 divisors, whose sum is σ = 221272748. Its totient is φ = 221272746.

The previous prime is 221272739. The next prime is 221272769. The reversal of 221272747 is 747272122.

221272747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221272747 - 2³ = 221272739 is a prime.

It is not a weakly prime, because it can be changed into another prime (221272717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110636373 + 110636374.

It is an arithmetic number, because the mean of its divisors is an integer number (110636374).

Almost surely, 2^221272747 is an apocalyptic number.

221272747 is a deficient number, since it is larger than the sum of its proper divisors (1).

221272747 is an equidigital number, since it uses as much as digits as its factorization.

221272747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 34.

The square root of 221272747 is about 14875.2393930316. The cubic root of 221272747 is about 604.8429772584.

The spelling of 221272747 in words is "two hundred twenty-one million, two hundred seventy-two thousand, seven hundred forty-seven".