21716294 has 4 divisors (see below), whose sum is σ = 32574444. Its totient is φ = 10858146.

The previous prime is 21716291. The next prime is 21716309. The reversal of 21716294 is 49261712.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21716294.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21716291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5429072 + ... + 5429075.

It is an arithmetic number, because the mean of its divisors is an integer number (8143611).

Almost surely, 2^21716294 is an apocalyptic number.

21716294 is a deficient number, since it is larger than the sum of its proper divisors (10858150).

21716294 is a wasteful number, since it uses less digits than its factorization.

21716294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10858149.

The product of its digits is 6048, while the sum is 32.

The square root of 21716294 is about 4660.0744629244. The cubic root of 21716294 is about 278.9942402771.

The spelling of 21716294 in words is "twenty-one million, seven hundred sixteen thousand, two hundred ninety-four".