21916341 has 6 divisors (see below), whose sum is σ = 31656950. Its totient is φ = 14610888.

The previous prime is 21916337. The next prime is 21916343. The reversal of 21916341 is 14361912.

21916341 is a `hidden beast` number, since 21 + 9 + 1 + 634 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 848241 = 4590^2 + 921^2 .

It is not a de Polignac number, because 21916341 - 2² = 21916337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21916343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1217566 + ... + 1217583.

Almost surely, 2^21916341 is an apocalyptic number.

It is an amenable number.

21916341 is a deficient number, since it is larger than the sum of its proper divisors (9740609).

21916341 is a wasteful number, since it uses less digits than its factorization.

21916341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435155 (or 2435152 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 21916341 is about 4681.4891861458. The cubic root of 21916341 is about 279.8483064384.

The spelling of 21916341 in words is "twenty-one million, nine hundred sixteen thousand, three hundred forty-one".