21073766 has 16 divisors (see below), whose sum is σ = 36896256. Its totient is φ = 8839176.

The previous prime is 21073739. The next prime is 21073799. The reversal of 21073766 is 66737012.

It is a super-2 number, since 2×21073766² = 888207226845512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15356 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (2306016).

Almost surely, 2^21073766 is an apocalyptic number.

21073766 is a deficient number, since it is larger than the sum of its proper divisors (15822490).

21073766 is a wasteful number, since it uses less digits than its factorization.

21073766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32083.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 21073766 is about 4590.6171698368. The cubic root of 21073766 is about 276.2150794977.

The spelling of 21073766 in words is "twenty-one million, seventy-three thousand, seven hundred sixty-six".