21873057 has 8 divisors (see below), whose sum is σ = 29235360. Its totient is φ = 14546400.

The previous prime is 21873053. The next prime is 21873077. The reversal of 21873057 is 75037812.

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

It is not a de Polignac number, because 21873057 - 2² = 21873053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21873053) 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 7 ways as a sum of consecutive naturals, for example, 7444 + ... + 9957.

It is an arithmetic number, because the mean of its divisors is an integer number (3654420).

Almost surely, 2^21873057 is an apocalyptic number.

It is an amenable number.

21873057 is a deficient number, since it is larger than the sum of its proper divisors (7362303).

21873057 is a wasteful number, since it uses less digits than its factorization.

21873057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17823.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 21873057 is about 4676.8640134175. The cubic root of 21873057 is about 279.6639548462.

The spelling of 21873057 in words is "twenty-one million, eight hundred seventy-three thousand, fifty-seven".