21158336 has 28 divisors (see below), whose sum is σ = 44458128. Its totient is φ = 9956352.

The previous prime is 21158329. The next prime is 21158377. The reversal of 21158336 is 63385112.

It is a junction number, because it is equal to n+sod(n) for n = 21158299 and 21158308.

It is a congruent number.

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, 8636 + ... + 10811.

Almost surely, 2^21158336 is an apocalyptic number.

It is an amenable number.

21158336 is an abundant number, since it is smaller than the sum of its proper divisors (23299792).

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

21158336 is a wasteful number, since it uses less digits than its factorization.

21158336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19476 (or 19466 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 21158336 is about 4599.8191268788. The cubic root of 21158336 is about 276.5840743126.

The spelling of 21158336 in words is "twenty-one million, one hundred fifty-eight thousand, three hundred thirty-six".