21150858 has 8 divisors (see below), whose sum is σ = 42301728. Its totient is φ = 7050284.

The previous prime is 21150847. The next prime is 21150859. The reversal of 21150858 is 85805112.

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

21150858 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21150859) 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 3 ways as a sum of consecutive naturals, for example, 1762566 + ... + 1762577.

It is an arithmetic number, because the mean of its divisors is an integer number (5287716).

Almost surely, 2^21150858 is an apocalyptic number.

21150858 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21150858 is a wasteful number, since it uses less digits than its factorization.

21150858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525148.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 21150858 is about 4599.0061969952. The cubic root of 21150858 is about 276.5514860627.

The spelling of 21150858 in words is "twenty-one million, one hundred fifty thousand, eight hundred fifty-eight".