23121949 has 4 divisors (see below), whose sum is σ = 23203936. Its totient is φ = 23039964.

The previous prime is 23121941. The next prime is 23121953. The reversal of 23121949 is 94912132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23121949 - 2³ = 23121941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23121949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121941) 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, 40569 + ... + 41134.

It is an arithmetic number, because the mean of its divisors is an integer number (5800984).

Almost surely, 2^23121949 is an apocalyptic number.

It is an amenable number.

23121949 is a deficient number, since it is larger than the sum of its proper divisors (81987).

23121949 is an equidigital number, since it uses as much as digits as its factorization.

23121949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81986.

The product of its digits is 3888, while the sum is 31.

The square root of 23121949 is about 4808.5287770793. The cubic root of 23121949 is about 284.8884307319. Note that the first 3 decimals are identical.

The spelling of 23121949 in words is "twenty-three million, one hundred twenty-one thousand, nine hundred forty-nine".