21082858 has 8 divisors (see below), whose sum is σ = 32999328. Its totient is φ = 10083084.

The previous prime is 21082849. The next prime is 21082861. The reversal of 21082858 is 85828012.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229116 + ... + 229207.

It is an arithmetic number, because the mean of its divisors is an integer number (4124916).

Almost surely, 2^21082858 is an apocalyptic number.

21082858 is a deficient number, since it is larger than the sum of its proper divisors (11916470).

21082858 is a wasteful number, since it uses less digits than its factorization.

21082858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458348.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 21082858 is about 4591.6073438394. The cubic root of 21082858 is about 276.2547969110.

The spelling of 21082858 in words is "twenty-one million, eighty-two thousand, eight hundred fifty-eight".