21012714 has 24 divisors (see below), whose sum is σ = 48206340. Its totient is φ = 6592128.

The previous prime is 21012701. The next prime is 21012737. The reversal of 21012714 is 41721012.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 5212089 = 3975^2 + 2283^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34029 + ... + 34640.

Almost surely, 2^21012714 is an apocalyptic number.

21012714 is an abundant number, since it is smaller than the sum of its proper divisors (27193626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012714 is a wasteful number, since it uses less digits than its factorization.

21012714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68694 (or 68691 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 21012714 is about 4583.9626961833. The cubic root of 21012714 is about 275.9480841230.

Adding to 21012714 its reverse (41721012), we get a palindrome (62733726).

The spelling of 21012714 in words is "twenty-one million, twelve thousand, seven hundred fourteen".