21916701 has 6 divisors (see below), whose sum is σ = 31657470. Its totient is φ = 14611128.

The previous prime is 21916669. The next prime is 21916753. The reversal of 21916701 is 10761912.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 3896676 = 4245^2 + 1974^2 .

It is not a de Polignac number, because 21916701 - 2⁵ = 21916669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916001) 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 in 5 ways as a sum of consecutive naturals, for example, 1217586 + ... + 1217603.

It is an arithmetic number, because the mean of its divisors is an integer number (5276245).

Almost surely, 2^21916701 is an apocalyptic number.

It is an amenable number.

21916701 is a deficient number, since it is larger than the sum of its proper divisors (9740769).

21916701 is a wasteful number, since it uses less digits than its factorization.

21916701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435195 (or 2435192 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21916701 is about 4681.5276352917. The cubic root of 21916701 is about 279.8498387020.

The spelling of 21916701 in words is "twenty-one million, nine hundred sixteen thousand, seven hundred one".