21226853 has 2 divisors, whose sum is σ = 21226854. Its totient is φ = 21226852.

The previous prime is 21226837. The next prime is 21226879. The reversal of 21226853 is 35862212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 2024929 = 4382^2 + 1423^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226853 - 2⁴ = 21226837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226823) 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, 10613426 + 10613427.

It is an arithmetic number, because the mean of its divisors is an integer number (10613427).

Almost surely, 2^21226853 is an apocalyptic number.

It is an amenable number.

21226853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226853 is an equidigital number, since it uses as much as digits as its factorization.

21226853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 21226853 is about 4607.2608999274. The cubic root of 21226853 is about 276.8823065196.

The spelling of 21226853 in words is "twenty-one million, two hundred twenty-six thousand, eight hundred fifty-three".