21867133 has 2 divisors, whose sum is σ = 21867134. Its totient is φ = 21867132.

The previous prime is 21867113. The next prime is 21867143. The reversal of 21867133 is 33176812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12020089 + 9847044 = 3467^2 + 3138^2 .

It is a cyclic number.

It is not a de Polignac number, because 21867133 - 2⁵ = 21867101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21867095 and 21867104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21867103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10933566 + 10933567.

It is an arithmetic number, because the mean of its divisors is an integer number (10933567).

Almost surely, 2^21867133 is an apocalyptic number.

It is an amenable number.

21867133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21867133 is an equidigital number, since it uses as much as digits as its factorization.

21867133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 21867133 is about 4676.2306401631. The cubic root of 21867133 is about 279.6387049256.

The spelling of 21867133 in words is "twenty-one million, eight hundred sixty-seven thousand, one hundred thirty-three".