21250133 has 2 divisors, whose sum is σ = 21250134. Its totient is φ = 21250132.

The previous prime is 21250129. The next prime is 21250139. The reversal of 21250133 is 33105212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17783089 + 3467044 = 4217^2 + 1862^2 .

It is a cyclic number.

It is not a de Polignac number, because 21250133 - 2² = 21250129 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21250139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10625066 + 10625067.

It is an arithmetic number, because the mean of its divisors is an integer number (10625067).

Almost surely, 2^21250133 is an apocalyptic number.

It is an amenable number.

21250133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21250133 is an equidigital number, since it uses as much as digits as its factorization.

21250133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21250133 is about 4609.7866544993. The cubic root of 21250133 is about 276.9834906989.

Adding to 21250133 its reverse (33105212), we get a palindrome (54355345).

The spelling of 21250133 in words is "twenty-one million, two hundred fifty thousand, one hundred thirty-three".