21714015 has 24 divisors (see below), whose sum is σ = 36913680. Its totient is φ = 10897408.

The previous prime is 21714013. The next prime is 21714023. The reversal of 21714015 is 51041712.

It is a happy number.

It is not a de Polignac number, because 21714015 - 2¹ = 21714013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21713982 and 21714000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21714013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1831 + ... + 6839.

It is an arithmetic number, because the mean of its divisors is an integer number (1538070).

Almost surely, 2^21714015 is an apocalyptic number.

21714015 is a deficient number, since it is larger than the sum of its proper divisors (15199665).

21714015 is a wasteful number, since it uses less digits than its factorization.

21714015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 21714015 is about 4659.8299325190. The cubic root of 21714015 is about 278.9844803227.

Adding to 21714015 its reverse (51041712), we get a palindrome (72755727).

The spelling of 21714015 in words is "twenty-one million, seven hundred fourteen thousand, fifteen".