23121331 has 2 divisors, whose sum is σ = 23121332. Its totient is φ = 23121330.

The previous prime is 23121283. The next prime is 23121341. The reversal of 23121331 is 13312132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121331 - 2¹⁵ = 23088563 is a prime.

It is a super-2 number, since 2×23121331² = 1069191894423122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23121341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560665 + 11560666.

It is an arithmetic number, because the mean of its divisors is an integer number (11560666).

Almost surely, 2^23121331 is an apocalyptic number.

23121331 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121331 is an equidigital number, since it uses as much as digits as its factorization.

23121331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 16.

The square root of 23121331 is about 4808.4645158304. The cubic root of 23121331 is about 284.8858925575.

Adding to 23121331 its reverse (13312132), we get a palindrome (36433463).

The spelling of 23121331 in words is "twenty-three million, one hundred twenty-one thousand, three hundred thirty-one".