23021261 has 2 divisors, whose sum is σ = 23021262. Its totient is φ = 23021260.

The previous prime is 23021249. The next prime is 23021263. The reversal of 23021261 is 16212032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19096900 + 3924361 = 4370^2 + 1981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23021261 is a prime.

Together with 23021263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23021263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510630 + 11510631.

It is an arithmetic number, because the mean of its divisors is an integer number (11510631).

Almost surely, 2^23021261 is an apocalyptic number.

It is an amenable number.

23021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021261 is an equidigital number, since it uses as much as digits as its factorization.

23021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 23021261 is about 4798.0476237737. The cubic root of 23021261 is about 284.4742991950.

Adding to 23021261 its reverse (16212032), we get a palindrome (39233293).

The spelling of 23021261 in words is "twenty-three million, twenty-one thousand, two hundred sixty-one".