21116073 has 12 divisors (see below), whose sum is σ = 30947504. Its totient is φ = 12797400.

The previous prime is 21116063. The next prime is 21116099. The reversal of 21116073 is 37061112.

It is not a de Polignac number, because 21116073 - 2¹⁷ = 20985001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21116063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28723 + ... + 29448.

Almost surely, 2^21116073 is an apocalyptic number.

It is an amenable number.

21116073 is a deficient number, since it is larger than the sum of its proper divisors (9831431).

21116073 is a wasteful number, since it uses less digits than its factorization.

21116073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58196 (or 58185 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21116073 is about 4595.2228455212. Note that the first 3 decimals coincide. The cubic root of 21116073 is about 276.3997960476.

Adding to 21116073 its reverse (37061112), we get a palindrome (58177185).

The spelling of 21116073 in words is "twenty-one million, one hundred sixteen thousand, seventy-three".