21933869 has 2 divisors, whose sum is σ = 21933870. Its totient is φ = 21933868.

The previous prime is 21933851. The next prime is 21933883. The reversal of 21933869 is 96833912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 4251844 = 4205^2 + 2062^2 .

It is a cyclic number.

It is not a de Polignac number, because 21933869 - 2¹⁶ = 21868333 is a prime.

It is a super-2 number, since 2×21933869² = 962189218618322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21933839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10966934 + 10966935.

It is an arithmetic number, because the mean of its divisors is an integer number (10966935).

Almost surely, 2^21933869 is an apocalyptic number.

It is an amenable number.

21933869 is a deficient number, since it is larger than the sum of its proper divisors (1).

21933869 is an equidigital number, since it uses as much as digits as its factorization.

21933869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 21933869 is about 4683.3608658740. The cubic root of 21933869 is about 279.9228911820.

The spelling of 21933869 in words is "twenty-one million, nine hundred thirty-three thousand, eight hundred sixty-nine".