21913716 has 24 divisors (see below), whose sum is σ = 55780704. Its totient is φ = 6640480.

The previous prime is 21913711. The next prime is 21913729. The reversal of 21913716 is 61731912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21913711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82875 + ... + 83138.

It is an arithmetic number, because the mean of its divisors is an integer number (2324196).

Almost surely, 2^21913716 is an apocalyptic number.

It is an amenable number.

21913716 is an abundant number, since it is smaller than the sum of its proper divisors (33866988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21913716 is a wasteful number, since it uses less digits than its factorization.

21913716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166031 (or 166029 counting only the distinct ones).

The product of its digits is 2268, while the sum is 30.

The square root of 21913716 is about 4681.2088182434. The cubic root of 21913716 is about 279.8371331752.

The spelling of 21913716 in words is "twenty-one million, nine hundred thirteen thousand, seven hundred sixteen".