21348433 has 2 divisors, whose sum is σ = 21348434. Its totient is φ = 21348432.

The previous prime is 21348421. The next prime is 21348443. The reversal of 21348433 is 33484312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15816529 + 5531904 = 3977^2 + 2352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21348433 is a prime.

It is not a weakly prime, because it can be changed into another prime (21348403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10674216 + 10674217.

It is an arithmetic number, because the mean of its divisors is an integer number (10674217).

Almost surely, 2^21348433 is an apocalyptic number.

It is an amenable number.

21348433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21348433 is an equidigital number, since it uses as much as digits as its factorization.

21348433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

The square root of 21348433 is about 4620.4364512457. The cubic root of 21348433 is about 277.4099288340.

The spelling of 21348433 in words is "twenty-one million, three hundred forty-eight thousand, four hundred thirty-three".