23121031 has 2 divisors, whose sum is σ = 23121032. Its totient is φ = 23121030.

The previous prime is 23121011. The next prime is 23121047. The reversal of 23121031 is 13012132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121031 - 2¹¹ = 23118983 is a prime.

It is a super-2 number, since 2×23121031² = 1069164149005922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560515 + 11560516.

It is an arithmetic number, because the mean of its divisors is an integer number (11560516).

Almost surely, 2^23121031 is an apocalyptic number.

23121031 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121031 is an equidigital number, since it uses as much as digits as its factorization.

23121031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 23121031 is about 4808.4333207397. The cubic root of 23121031 is about 284.8846604177.

Adding to 23121031 its reverse (13012132), we get a palindrome (36133163).

The spelling of 23121031 in words is "twenty-three million, one hundred twenty-one thousand, thirty-one".