21073916 has 12 divisors (see below), whose sum is σ = 36979320. Its totient is φ = 10508400.

The previous prime is 21073909. The next prime is 21073919. The reversal of 21073916 is 61937012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5435 + ... + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (3081610).

Almost surely, 2^21073916 is an apocalyptic number.

It is an amenable number.

21073916 is a deficient number, since it is larger than the sum of its proper divisors (15905404).

21073916 is a wasteful number, since it uses less digits than its factorization.

21073916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14284 (or 14282 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21073916 is about 4590.6335074802. The cubic root of 21073916 is about 276.2157348490.

The spelling of 21073916 in words is "twenty-one million, seventy-three thousand, nine hundred sixteen".