21884057 has 8 divisors (see below), whose sum is σ = 24204936. Its totient is φ = 19654272.

The previous prime is 21884041. The next prime is 21884081. The reversal of 21884057 is 75048812.

It can be written as a sum of positive squares in 4 ways, for example, as 1263376 + 20620681 = 1124^2 + 4541^2 .

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 21884057 - 2⁴ = 21884041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21884957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22268 + ... + 23229.

It is an arithmetic number, because the mean of its divisors is an integer number (3025617).

Almost surely, 2^21884057 is an apocalyptic number.

It is an amenable number.

21884057 is a deficient number, since it is larger than the sum of its proper divisors (2320879).

21884057 is a wasteful number, since it uses less digits than its factorization.

21884057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45547.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21884057 is about 4678.0398672948. The cubic root of 21884057 is about 279.7108281594.

The spelling of 21884057 in words is "twenty-one million, eight hundred eighty-four thousand, fifty-seven".