21014073 has 20 divisors (see below), whose sum is σ = 31913508. Its totient is φ = 13776480.

The previous prime is 21014069. The next prime is 21014087. The reversal of 21014073 is 37041012.

It can be written as a sum of positive squares in 2 ways, for example, as 1327104 + 19686969 = 1152^2 + 4437^2 .

It is not a de Polignac number, because 21014073 - 2² = 21014069 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21014093) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2815 + ... + 7067.

Almost surely, 2^21014073 is an apocalyptic number.

It is an amenable number.

21014073 is a deficient number, since it is larger than the sum of its proper divisors (10899435).

21014073 is an equidigital number, since it uses as much as digits as its factorization.

21014073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326 (or 4317 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 21014073 is about 4584.1109279772. The cubic root of 21014073 is about 275.9540329875.

Adding to 21014073 its reverse (37041012), we get a palindrome (58055085).

The spelling of 21014073 in words is "twenty-one million, fourteen thousand, seventy-three".