21044293 has 2 divisors, whose sum is σ = 21044294. Its totient is φ = 21044292.

The previous prime is 21044291. The next prime is 21044311. The reversal of 21044293 is 39244012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20493729 + 550564 = 4527^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044293 - 2¹ = 21044291 is a prime.

Together with 21044291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522146 + 10522147.

It is an arithmetic number, because the mean of its divisors is an integer number (10522147).

Almost surely, 2^21044293 is an apocalyptic number.

It is an amenable number.

21044293 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044293 is an equidigital number, since it uses as much as digits as its factorization.

21044293 is an odious number, because the sum of its binary digits is odd.

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

The square root of 21044293 is about 4587.4059118417. The cubic root of 21044293 is about 276.0862513111.

The spelling of 21044293 in words is "twenty-one million, forty-four thousand, two hundred ninety-three".