21514727 has 4 divisors (see below), whose sum is σ = 23169720. Its totient is φ = 19859736.

The previous prime is 21514721. The next prime is 21514739. The reversal of 21514727 is 72741512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21514727 - 2¹⁴ = 21498343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21514727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514721) 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, 827477 + ... + 827502.

It is an arithmetic number, because the mean of its divisors is an integer number (5792430).

Almost surely, 2^21514727 is an apocalyptic number.

21514727 is a deficient number, since it is larger than the sum of its proper divisors (1654993).

21514727 is a wasteful number, since it uses less digits than its factorization.

21514727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654992.

The product of its digits is 3920, while the sum is 29.

The square root of 21514727 is about 4638.3970291470. The cubic root of 21514727 is about 278.1283631626.

The spelling of 21514727 in words is "twenty-one million, five hundred fourteen thousand, seven hundred twenty-seven".