21487714 has 4 divisors (see below), whose sum is σ = 32231574. Its totient is φ = 10743856.

The previous prime is 21487709. The next prime is 21487717. The reversal of 21487714 is 41778412.

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

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 4489 = 4635^2 + 67^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21487714.

It is not an unprimeable number, because it can be changed into a prime (21487717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5371927 + ... + 5371930.

Almost surely, 2^21487714 is an apocalyptic number.

21487714 is a deficient number, since it is larger than the sum of its proper divisors (10743860).

21487714 is a wasteful number, since it uses less digits than its factorization.

21487714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10743859.

The product of its digits is 12544, while the sum is 34.

The square root of 21487714 is about 4635.4842249759. The cubic root of 21487714 is about 278.0119122615.

It can be divided in two parts, 21487 and 714, that added together give a square (22201 = 149²).

The spelling of 21487714 in words is "twenty-one million, four hundred eighty-seven thousand, seven hundred fourteen".