23121247 has 2 divisors, whose sum is σ = 23121248. Its totient is φ = 23121246.

The previous prime is 23121209. The next prime is 23121281. The reversal of 23121247 is 74212132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121247 - 2²³ = 14732639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560623 + 11560624.

It is an arithmetic number, because the mean of its divisors is an integer number (11560624).

Almost surely, 2^23121247 is an apocalyptic number.

23121247 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121247 is an equidigital number, since it uses as much as digits as its factorization.

23121247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 22.

The square root of 23121247 is about 4808.4557812254. The cubic root of 23121247 is about 284.8855475594.

Adding to 23121247 its reverse (74212132), we get a palindrome (97333379).

The spelling of 23121247 in words is "twenty-three million, one hundred twenty-one thousand, two hundred forty-seven".