21114203221 has 2 divisors, whose sum is σ = 21114203222. Its totient is φ = 21114203220.

The previous prime is 21114203213. The next prime is 21114203233. The reversal of 21114203221 is 12230241112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16644612196 + 4469591025 = 129014^2 + 66855^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114203221 - 2³ = 21114203213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21114233221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557101610 + 10557101611.

It is an arithmetic number, because the mean of its divisors is an integer number (10557101611).

Almost surely, 2^21114203221 is an apocalyptic number.

It is an amenable number.

21114203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114203221 is an equidigital number, since it uses as much as digits as its factorization.

21114203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21114203221 its reverse (12230241112), we get a palindrome (33344444333).

The spelling of 21114203221 in words is "twenty-one billion, one hundred fourteen million, two hundred three thousand, two hundred twenty-one".