221474647 has 2 divisors, whose sum is σ = 221474648. Its totient is φ = 221474646.

The previous prime is 221474557. The next prime is 221474717. The reversal of 221474647 is 746474122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221474647 - 2¹¹ = 221472599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221474947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110737323 + 110737324.

It is an arithmetic number, because the mean of its divisors is an integer number (110737324).

Almost surely, 2^221474647 is an apocalyptic number.

221474647 is a deficient number, since it is larger than the sum of its proper divisors (1).

221474647 is an equidigital number, since it uses as much as digits as its factorization.

221474647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 37.

The square root of 221474647 is about 14882.0242910701. The cubic root of 221474647 is about 605.0268840363.

The spelling of 221474647 in words is "two hundred twenty-one million, four hundred seventy-four thousand, six hundred forty-seven".