21482158 has 4 divisors (see below), whose sum is σ = 32223240. Its totient is φ = 10741078.

The previous prime is 21482147. The next prime is 21482159. The reversal of 21482158 is 85128412.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21482158² = 922966224673928, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21482159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5370538 + ... + 5370541.

It is an arithmetic number, because the mean of its divisors is an integer number (8055810).

Almost surely, 2^21482158 is an apocalyptic number.

21482158 is a deficient number, since it is larger than the sum of its proper divisors (10741082).

21482158 is a wasteful number, since it uses less digits than its factorization.

21482158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10741081.

The product of its digits is 5120, while the sum is 31.

The square root of 21482158 is about 4634.8848960897. The cubic root of 21482158 is about 277.9879486866.

The spelling of 21482158 in words is "twenty-one million, four hundred eighty-two thousand, one hundred fifty-eight".