21263093 has 2 divisors, whose sum is σ = 21263094. Its totient is φ = 21263092.

The previous prime is 21263089. The next prime is 21263149. The reversal of 21263093 is 39036212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 6340324 = 3863^2 + 2518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21263093 - 2² = 21263089 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21263083) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10631546 + 10631547.

It is an arithmetic number, because the mean of its divisors is an integer number (10631547).

Almost surely, 2^21263093 is an apocalyptic number.

It is an amenable number.

21263093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21263093 is an equidigital number, since it uses as much as digits as its factorization.

21263093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21263093 is about 4611.1921452050. The cubic root of 21263093 is about 277.0397880175.

The spelling of 21263093 in words is "twenty-one million, two hundred sixty-three thousand, ninety-three".