21148133 has 2 divisors, whose sum is σ = 21148134. Its totient is φ = 21148132.

The previous prime is 21148123. The next prime is 21148157. The reversal of 21148133 is 33184112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16957924 + 4190209 = 4118^2 + 2047^2 .

It is a cyclic number.

It is not a de Polignac number, because 21148133 - 2¹⁶ = 21082597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21148099 and 21148108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21148123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10574066 + 10574067.

It is an arithmetic number, because the mean of its divisors is an integer number (10574067).

Almost surely, 2^21148133 is an apocalyptic number.

It is an amenable number.

21148133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21148133 is an equidigital number, since it uses as much as digits as its factorization.

21148133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 21148133 is about 4598.7099277950. The cubic root of 21148133 is about 276.5396089217.

The spelling of 21148133 in words is "twenty-one million, one hundred forty-eight thousand, one hundred thirty-three".