21194933 has 2 divisors, whose sum is σ = 21194934. Its totient is φ = 21194932.

The previous prime is 21194879. The next prime is 21194959. The reversal of 21194933 is 33949112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 465124 = 4553^2 + 682^2 .

It is a cyclic number.

It is not a de Polignac number, because 21194933 - 2¹² = 21190837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21194933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21194993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597466 + 10597467.

It is an arithmetic number, because the mean of its divisors is an integer number (10597467).

Almost surely, 2^21194933 is an apocalyptic number.

It is an amenable number.

21194933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21194933 is an equidigital number, since it uses as much as digits as its factorization.

21194933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 21194933 is about 4603.7954993679. The cubic root of 21194933 is about 276.7434491167.

The spelling of 21194933 in words is "twenty-one million, one hundred ninety-four thousand, nine hundred thirty-three".