21943099 has 2 divisors, whose sum is σ = 21943100. Its totient is φ = 21943098.

The previous prime is 21943093. The next prime is 21943171. The reversal of 21943099 is 99034912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21943099 - 2³ = 21943091 is a prime.

It is not a weakly prime, because it can be changed into another prime (21943091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10971549 + 10971550.

It is an arithmetic number, because the mean of its divisors is an integer number (10971550).

Almost surely, 2^21943099 is an apocalyptic number.

21943099 is a deficient number, since it is larger than the sum of its proper divisors (1).

21943099 is an equidigital number, since it uses as much as digits as its factorization.

21943099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 21943099 is about 4684.3461656884. The cubic root of 21943099 is about 279.9621504961.

The spelling of 21943099 in words is "twenty-one million, nine hundred forty-three thousand, ninety-nine".