23221447 has 2 divisors, whose sum is σ = 23221448. Its totient is φ = 23221446.

The previous prime is 23221417. The next prime is 23221481. The reversal of 23221447 is 74412232.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23221447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23221417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610723 + 11610724.

It is an arithmetic number, because the mean of its divisors is an integer number (11610724).

Almost surely, 2^23221447 is an apocalyptic number.

23221447 is a deficient number, since it is larger than the sum of its proper divisors (1).

23221447 is an equidigital number, since it uses as much as digits as its factorization.

23221447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 25.

The square root of 23221447 is about 4818.8636627321. The cubic root of 23221447 is about 285.2964884163.

Adding to 23221447 its reverse (74412232), we get a palindrome (97633679).

The spelling of 23221447 in words is "twenty-three million, two hundred twenty-one thousand, four hundred forty-seven".