21224714 has 16 divisors (see below), whose sum is σ = 37232448. Its totient is φ = 8884512.

The previous prime is 21224689. The next prime is 21224737. The reversal of 21224714 is 41742212.

21224714 = T₉₇₂ + T₉₇₃ + ... + T₁₀₁₄.

It is a self number, because there is not a number n which added to its sum of digits gives 21224714.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17027 + ... + 18230.

It is an arithmetic number, because the mean of its divisors is an integer number (2327028).

Almost surely, 2^21224714 is an apocalyptic number.

21224714 is a deficient number, since it is larger than the sum of its proper divisors (16007734).

21224714 is a wasteful number, since it uses less digits than its factorization.

21224714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35309.

The product of its digits is 896, while the sum is 23.

The square root of 21224714 is about 4607.0287604920. The cubic root of 21224714 is about 276.8730058608.

Adding to 21224714 its reverse (41742212), we get a palindrome (62966926).

The spelling of 21224714 in words is "twenty-one million, two hundred twenty-four thousand, seven hundred fourteen".