21481158 has 16 divisors (see below), whose sum is σ = 43012656. Its totient is φ = 7152000.

The previous prime is 21481111. The next prime is 21481177. The reversal of 21481158 is 85118412.

It is a happy number.

It is a super-2 number, since 2×21481158² = 922880298041928, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5658 + ... + 8658.

It is an arithmetic number, because the mean of its divisors is an integer number (2688291).

Almost surely, 2^21481158 is an apocalyptic number.

21481158 is an abundant number, since it is smaller than the sum of its proper divisors (21531498).

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

21481158 is a wasteful number, since it uses less digits than its factorization.

21481158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199.

The product of its digits is 2560, while the sum is 30.

The square root of 21481158 is about 4634.7770172900. Note that the first 3 decimals coincide. The cubic root of 21481158 is about 277.9836351494.

The spelling of 21481158 in words is "twenty-one million, four hundred eighty-one thousand, one hundred fifty-eight".