23121001 has 4 divisors (see below), whose sum is σ = 23172052. Its totient is φ = 23069952.

The previous prime is 23120989. The next prime is 23121011. The reversal of 23121001 is 10012132.

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 15960025 + 7160976 = 3995^2 + 2676^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121001 - 2⁷ = 23120873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a 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 in 3 ways as a sum of consecutive naturals, for example, 24840 + ... + 25753.

It is an arithmetic number, because the mean of its divisors is an integer number (5793013).

Almost surely, 2^23121001 is an apocalyptic number.

It is an amenable number.

23121001 is a deficient number, since it is larger than the sum of its proper divisors (51051).

23121001 is an equidigital number, since it uses as much as digits as its factorization.

23121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 23121001 is about 4808.4302012195. The cubic root of 23121001 is about 284.8845372031.

Adding to 23121001 its reverse (10012132), we get a palindrome (33133133).

The spelling of 23121001 in words is "twenty-three million, one hundred twenty-one thousand, one".