21094999 has 2 divisors, whose sum is σ = 21095000. Its totient is φ = 21094998.

The previous prime is 21094937. The next prime is 21095003. The reversal of 21094999 is 99949012.

21094999 is nontrivially palindromic in base 12.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21094999 - 2²³ = 12706391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547499 + 10547500.

It is an arithmetic number, because the mean of its divisors is an integer number (10547500).

Almost surely, 2^21094999 is an apocalyptic number.

21094999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21094999 is an equidigital number, since it uses as much as digits as its factorization.

21094999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 21094999 is about 4592.9292396030. The cubic root of 21094999 is about 276.3078157486.

The spelling of 21094999 in words is "twenty-one million, ninety-four thousand, nine hundred ninety-nine".