23121019 has 4 divisors (see below), whose sum is σ = 23153296. Its totient is φ = 23088744.

The previous prime is 23121011. The next prime is 23121031. The reversal of 23121019 is 91012132.

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

It is a cyclic number.

It is not a de Polignac number, because 23121019 - 2³ = 23121011 is a prime.

It is a super-2 number, since 2×23121019² = 1069163039196722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23120987 and 23121005.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15039 + ... + 16504.

It is an arithmetic number, because the mean of its divisors is an integer number (5788324).

Almost surely, 2^23121019 is an apocalyptic number.

23121019 is a deficient number, since it is larger than the sum of its proper divisors (32277).

23121019 is an equidigital number, since it uses as much as digits as its factorization.

23121019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32276.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 23121019 is about 4808.4320729319. The cubic root of 23121019 is about 284.8846111319.

The spelling of 23121019 in words is "twenty-three million, one hundred twenty-one thousand, nineteen".