21348133 has 2 divisors, whose sum is σ = 21348134. Its totient is φ = 21348132.

The previous prime is 21348127. The next prime is 21348161. The reversal of 21348133 is 33184312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19210689 + 2137444 = 4383^2 + 1462^2 .

It is a cyclic number.

It is not a de Polignac number, because 21348133 - 2⁵ = 21348101 is a prime.

It is equal to p_1350583 and since 21348133 and 1350583 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 21348098 and 21348107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21348433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10674066 + 10674067.

It is an arithmetic number, because the mean of its divisors is an integer number (10674067).

Almost surely, 2^21348133 is an apocalyptic number.

It is an amenable number.

21348133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21348133 is an equidigital number, since it uses as much as digits as its factorization.

21348133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 21348133 is about 4620.4039866661. The cubic root of 21348133 is about 277.4086293886.

The spelling of 21348133 in words is "twenty-one million, three hundred forty-eight thousand, one hundred thirty-three".