21332102221 has 2 divisors, whose sum is σ = 21332102222. Its totient is φ = 21332102220.

The previous prime is 21332102203. The next prime is 21332102369. The reversal of 21332102221 is 12220123312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21100758121 + 231344100 = 145261^2 + 15210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21332102221 - 2⁵ = 21332102189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21332102521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10666051110 + 10666051111.

It is an arithmetic number, because the mean of its divisors is an integer number (10666051111).

Almost surely, 2^21332102221 is an apocalyptic number.

It is an amenable number.

21332102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21332102221 is an equidigital number, since it uses as much as digits as its factorization.

21332102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21332102221 its reverse (12220123312), we get a palindrome (33552225533).

The spelling of 21332102221 in words is "twenty-one billion, three hundred thirty-two million, one hundred two thousand, two hundred twenty-one".