23121011 has 2 divisors, whose sum is σ = 23121012. Its totient is φ = 23121010.

The previous prime is 23120989. The next prime is 23121031. The reversal of 23121011 is 11012132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23121011 - 2¹⁸ = 22858867 is a prime.

It is a super-2 number, since 2×23121011² = 1069162299324242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23120983 and 23121001.

It is not a weakly prime, because it can be changed into another prime (23121031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560505 + 11560506.

It is an arithmetic number, because the mean of its divisors is an integer number (11560506).

Almost surely, 2^23121011 is an apocalyptic number.

23121011 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121011 is an equidigital number, since it uses as much as digits as its factorization.

23121011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 23121011 is about 4808.4312410598. The cubic root of 23121011 is about 284.8845782747.

Adding to 23121011 its reverse (11012132), we get a palindrome (34133143).

The spelling of 23121011 in words is "twenty-three million, one hundred twenty-one thousand, eleven".