21358082 has 4 divisors (see below), whose sum is σ = 32037126. Its totient is φ = 10679040.

The previous prime is 21358079. The next prime is 21358087. The reversal of 21358082 is 28085312.

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

It can be written as a sum of positive squares in only one way, i.e., 18498601 + 2859481 = 4301^2 + 1691^2 .

It is not an unprimeable number, because it can be changed into a prime (21358087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5339519 + ... + 5339522.

Almost surely, 2^21358082 is an apocalyptic number.

21358082 is a deficient number, since it is larger than the sum of its proper divisors (10679044).

21358082 is a wasteful number, since it uses less digits than its factorization.

21358082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10679043.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 21358082 is about 4621.4804987147. The cubic root of 21358082 is about 277.4517168383.

The spelling of 21358082 in words is "twenty-one million, three hundred fifty-eight thousand, eighty-two".