23121829 has 4 divisors (see below), whose sum is σ = 23350860. Its totient is φ = 22892800.

The previous prime is 23121821. The next prime is 23121851. The reversal of 23121829 is 92812132.

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 19377604 + 3744225 = 4402^2 + 1935^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121829 - 2³ = 23121821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23121797 and 23121806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114364 + ... + 114565.

It is an arithmetic number, because the mean of its divisors is an integer number (5837715).

Almost surely, 2^23121829 is an apocalyptic number.

It is an amenable number.

23121829 is a deficient number, since it is larger than the sum of its proper divisors (229031).

23121829 is a wasteful number, since it uses less digits than its factorization.

23121829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229030.

The product of its digits is 1728, while the sum is 28.

The square root of 23121829 is about 4808.5162992341. The cubic root of 23121829 is about 284.8879378861.

The spelling of 23121829 in words is "twenty-three million, one hundred twenty-one thousand, eight hundred twenty-nine".