21916093 has 2 divisors, whose sum is σ = 21916094. Its totient is φ = 21916092.

The previous prime is 21916087. The next prime is 21916109. The reversal of 21916093 is 39061912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11437924 + 10478169 = 3382^2 + 3237^2 .

It is a cyclic number.

It is not a de Polignac number, because 21916093 - 2¹³ = 21907901 is a prime.

It is a super-3 number, since 3×21916093³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21916003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10958046 + 10958047.

It is an arithmetic number, because the mean of its divisors is an integer number (10958047).

Almost surely, 2^21916093 is an apocalyptic number.

It is an amenable number.

21916093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21916093 is an equidigital number, since it uses as much as digits as its factorization.

21916093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 21916093 is about 4681.4626987727. The cubic root of 21916093 is about 279.8472508692.

The spelling of 21916093 in words is "twenty-one million, nine hundred sixteen thousand, ninety-three".