221626147 has 2 divisors, whose sum is σ = 221626148. Its totient is φ = 221626146.

The previous prime is 221626129. The next prime is 221626157. The reversal of 221626147 is 741626122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221626147 - 2²³ = 213237539 is a prime.

It is not a weakly prime, because it can be changed into another prime (221626117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110813073 + 110813074.

It is an arithmetic number, because the mean of its divisors is an integer number (110813074).

Almost surely, 2^221626147 is an apocalyptic number.

221626147 is a deficient number, since it is larger than the sum of its proper divisors (1).

221626147 is an equidigital number, since it uses as much as digits as its factorization.

221626147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 221626147 is about 14887.1134542597. The cubic root of 221626147 is about 605.1648090490.

The spelling of 221626147 in words is "two hundred twenty-one million, six hundred twenty-six thousand, one hundred forty-seven".