21412133 has 2 divisors, whose sum is σ = 21412134. Its totient is φ = 21412132.

The previous prime is 21412123. The next prime is 21412177. The reversal of 21412133 is 33121412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 4255969 = 4142^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 21412133 - 2²² = 17217829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21412123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706066 + 10706067.

It is an arithmetic number, because the mean of its divisors is an integer number (10706067).

Almost surely, 2^21412133 is an apocalyptic number.

It is an amenable number.

21412133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21412133 is an equidigital number, since it uses as much as digits as its factorization.

21412133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 17.

The square root of 21412133 is about 4627.3246049959. The cubic root of 21412133 is about 277.6855691398.

Adding to 21412133 its reverse (33121412), we get a palindrome (54533545).

The spelling of 21412133 in words is "twenty-one million, four hundred twelve thousand, one hundred thirty-three".