21450293 has 2 divisors, whose sum is σ = 21450294. Its totient is φ = 21450292.

The previous prime is 21450241. The next prime is 21450313. The reversal of 21450293 is 39205412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 8655364 = 3577^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 21450293 - 2⁶ = 21450229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21450493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725146 + 10725147.

It is an arithmetic number, because the mean of its divisors is an integer number (10725147).

Almost surely, 2^21450293 is an apocalyptic number.

It is an amenable number.

21450293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21450293 is an equidigital number, since it uses as much as digits as its factorization.

21450293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21450293 is about 4631.4461024609. The cubic root of 21450293 is about 277.8504319405.

The spelling of 21450293 in words is "twenty-one million, four hundred fifty thousand, two hundred ninety-three".