21036091 has 8 divisors (see below), whose sum is σ = 21720800. Its totient is φ = 20357568.

The previous prime is 21036083. The next prime is 21036131. The reversal of 21036091 is 19063012.

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

It is a cyclic number.

It is not a de Polignac number, because 21036091 - 2³ = 21036083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21036031) by changing a digit.

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, 5935 + ... + 8791.

It is an arithmetic number, because the mean of its divisors is an integer number (2715100).

Almost surely, 2^21036091 is an apocalyptic number.

21036091 is a deficient number, since it is larger than the sum of its proper divisors (684709).

21036091 is a wasteful number, since it uses less digits than its factorization.

21036091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 21036091 is about 4586.5118554300. The cubic root of 21036091 is about 276.0503785025.

The spelling of 21036091 in words is "twenty-one million, thirty-six thousand, ninety-one".