23121013 has 4 divisors (see below), whose sum is σ = 23500108. Its totient is φ = 22741920.

The previous prime is 23121011. The next prime is 23121031. The reversal of 23121013 is 31012132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11135569 + 11985444 = 3337^2 + 3462^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121013 - 2¹ = 23121011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23120984 and 23121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189456 + ... + 189577.

It is an arithmetic number, because the mean of its divisors is an integer number (5875027).

Almost surely, 2^23121013 is an apocalyptic number.

It is an amenable number.

23121013 is a deficient number, since it is larger than the sum of its proper divisors (379095).

23121013 is an equidigital number, since it uses as much as digits as its factorization.

23121013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379094.

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

The square root of 23121013 is about 4808.4314490278. The cubic root of 23121013 is about 284.8845864890.

Adding to 23121013 its reverse (31012132), we get a palindrome (54133145).

The spelling of 23121013 in words is "twenty-three million, one hundred twenty-one thousand, thirteen".