23019821 has 8 divisors (see below), whose sum is σ = 25147488. Its totient is φ = 20898000.

The previous prime is 23019817. The next prime is 23019827. The reversal of 23019821 is 12891032.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23019821 - 2² = 23019817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23019827) 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 7 ways as a sum of consecutive naturals, for example, 13391 + ... + 15011.

It is an arithmetic number, because the mean of its divisors is an integer number (3143436).

Almost surely, 2^23019821 is an apocalyptic number.

It is an amenable number.

23019821 is a deficient number, since it is larger than the sum of its proper divisors (2127667).

23019821 is a wasteful number, since it uses less digits than its factorization.

23019821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 23019821 is about 4797.8975603904. The cubic root of 23019821 is about 284.4683676993.

The spelling of 23019821 in words is "twenty-three million, nineteen thousand, eight hundred twenty-one".