21694514 has 4 divisors (see below), whose sum is σ = 32541774. Its totient is φ = 10847256.

The previous prime is 21694511. The next prime is 21694537. The reversal of 21694514 is 41549612.

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., 20295025 + 1399489 = 4505^2 + 1183^2 .

It is not an unprimeable number, because it can be changed into a prime (21694511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5423627 + ... + 5423630.

Almost surely, 2^21694514 is an apocalyptic number.

21694514 is a deficient number, since it is larger than the sum of its proper divisors (10847260).

21694514 is a wasteful number, since it uses less digits than its factorization.

21694514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10847259.

The product of its digits is 8640, while the sum is 32.

The square root of 21694514 is about 4657.7370041684. The cubic root of 21694514 is about 278.9009381829.

The spelling of 21694514 in words is "twenty-one million, six hundred ninety-four thousand, five hundred fourteen".