23213147 has 2 divisors, whose sum is σ = 23213148. Its totient is φ = 23213146.

The previous prime is 23213131. The next prime is 23213149. The reversal of 23213147 is 74131232.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23213147 - 2⁴ = 23213131 is a prime.

Together with 23213149, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23213149) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606573 + 11606574.

It is an arithmetic number, because the mean of its divisors is an integer number (11606574).

Almost surely, 2^23213147 is an apocalyptic number.

23213147 is a deficient number, since it is larger than the sum of its proper divisors (1).

23213147 is an equidigital number, since it uses as much as digits as its factorization.

23213147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 23213147 is about 4818.0023868819. The cubic root of 23213147 is about 285.2624933623.

Subtracting from 23213147 its sum of digits (23), we obtain a square (23213124 = 4818²).

Adding to 23213147 its reverse (74131232), we get a palindrome (97344379).

The spelling of 23213147 in words is "twenty-three million, two hundred thirteen thousand, one hundred forty-seven".