21073093 has 2 divisors, whose sum is σ = 21073094. Its totient is φ = 21073092.

The previous prime is 21073069. The next prime is 21073097. The reversal of 21073093 is 39037012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20223009 + 850084 = 4497^2 + 922^2 .

It is a cyclic number.

It is not a de Polignac number, because 21073093 - 2⁹ = 21072581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21073097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536546 + 10536547.

It is an arithmetic number, because the mean of its divisors is an integer number (10536547).

Almost surely, 2^21073093 is an apocalyptic number.

It is an amenable number.

21073093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073093 is an equidigital number, since it uses as much as digits as its factorization.

21073093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 21073093 is about 4590.5438675608. The cubic root of 21073093 is about 276.2121391163.

The spelling of 21073093 in words is "twenty-one million, seventy-three thousand, ninety-three".