21056083 has 8 divisors (see below), whose sum is σ = 21633696. Its totient is φ = 20481600.

The previous prime is 21056069. The next prime is 21056089. The reversal of 21056083 is 38065012.

It is a happy number.

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 21056083 - 2⁵ = 21056051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21056089) 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, 20113 + ... + 21133.

It is an arithmetic number, because the mean of its divisors is an integer number (2704212).

Almost surely, 2^21056083 is an apocalyptic number.

21056083 is a deficient number, since it is larger than the sum of its proper divisors (577613).

21056083 is a wasteful number, since it uses less digits than its factorization.

21056083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21056083 is about 4588.6907718869. The cubic root of 21056083 is about 276.1378005081.

The spelling of 21056083 in words is "twenty-one million, fifty-six thousand, eighty-three".