21651314 has 4 divisors (see below), whose sum is σ = 32476974. Its totient is φ = 10825656.

The previous prime is 21651307. The next prime is 21651323. The reversal of 21651314 is 41315612.

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., 21114025 + 537289 = 4595^2 + 733^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21651314.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5412827 + ... + 5412830.

Almost surely, 2^21651314 is an apocalyptic number.

21651314 is a deficient number, since it is larger than the sum of its proper divisors (10825660).

21651314 is a wasteful number, since it uses less digits than its factorization.

21651314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10825659.

The product of its digits is 720, while the sum is 23.

The square root of 21651314 is about 4653.0972480704. The cubic root of 21651314 is about 278.7156912469.

Adding to 21651314 its reverse (41315612), we get a palindrome (62966926).

The spelling of 21651314 in words is "twenty-one million, six hundred fifty-one thousand, three hundred fourteen".