21286514 has 4 divisors (see below), whose sum is σ = 31929774. Its totient is φ = 10643256.

The previous prime is 21286513. The next prime is 21286537. The reversal of 21286514 is 41568212.

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., 20857489 + 429025 = 4567^2 + 655^2 .

It is not an unprimeable number, because it can be changed into a prime (21286511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5321627 + ... + 5321630.

Almost surely, 2^21286514 is an apocalyptic number.

21286514 is a deficient number, since it is larger than the sum of its proper divisors (10643260).

21286514 is a wasteful number, since it uses less digits than its factorization.

21286514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10643259.

The product of its digits is 3840, while the sum is 29.

The square root of 21286514 is about 4613.7310281376. The cubic root of 21286514 is about 277.1414691791.

The spelling of 21286514 in words is "twenty-one million, two hundred eighty-six thousand, five hundred fourteen".