23125000021 has 4 divisors (see below), whose sum is σ = 23504098444. Its totient is φ = 22745901600.

The previous prime is 23125000013. The next prime is 23125000043. The reversal of 23125000021 is 12000052132.

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 1578870225 + 21546129796 = 39735^2 + 146786^2 .

It is a cyclic number.

It is not a de Polignac number, because 23125000021 - 2³ = 23125000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23124999959 and 23125000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23125000051) 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, 189549120 + ... + 189549241.

It is an arithmetic number, because the mean of its divisors is an integer number (5876024611).

Almost surely, 2^23125000021 is an apocalyptic number.

It is an amenable number.

23125000021 is a deficient number, since it is larger than the sum of its proper divisors (379098423).

23125000021 is an equidigital number, since it uses as much as digits as its factorization.

23125000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379098422.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 23125000021 its reverse (12000052132), we get a palindrome (35125052153).

The spelling of 23125000021 in words is "twenty-three billion, one hundred twenty-five million, twenty-one", and thus it is an aban number.