21382885 has 16 divisors (see below), whose sum is σ = 27590400. Its totient is φ = 15857856.

The previous prime is 21382883. The next prime is 21382913. The reversal of 21382885 is 58828312.

It is not a de Polignac number, because 21382885 - 2¹ = 21382883 is a prime.

It is a super-3 number, since 3×21382885³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2071 + ... + 6859.

It is an arithmetic number, because the mean of its divisors is an integer number (1724400).

Almost surely, 2^21382885 is an apocalyptic number.

It is an amenable number.

21382885 is a deficient number, since it is larger than the sum of its proper divisors (6207515).

21382885 is a wasteful number, since it uses less digits than its factorization.

21382885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4860.

The product of its digits is 30720, while the sum is 37.

The square root of 21382885 is about 4624.1631675364. The cubic root of 21382885 is about 277.5590762411.

The spelling of 21382885 in words is "twenty-one million, three hundred eighty-two thousand, eight hundred eighty-five".