21036718 has 16 divisors (see below), whose sum is σ = 34190640. Its totient is φ = 9668736.

The previous prime is 21036713. The next prime is 21036721. The reversal of 21036718 is 81763012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5733 + ... + 8656.

It is an arithmetic number, because the mean of its divisors is an integer number (2136915).

Almost surely, 2^21036718 is an apocalyptic number.

21036718 is a deficient number, since it is larger than the sum of its proper divisors (13153922).

21036718 is a wasteful number, since it uses less digits than its factorization.

21036718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14451.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21036718 is about 4586.5802075185. The cubic root of 21036718 is about 276.0531211202.

The spelling of 21036718 in words is "twenty-one million, thirty-six thousand, seven hundred eighteen".