21221301301 has 2 divisors, whose sum is σ = 21221301302. Its totient is φ = 21221301300.

The previous prime is 21221301287. The next prime is 21221301341. The reversal of 21221301301 is 10310312212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10941369201 + 10279932100 = 104601^2 + 101390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221301301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221301341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610650650 + 10610650651.

It is an arithmetic number, because the mean of its divisors is an integer number (10610650651).

Almost surely, 2^21221301301 is an apocalyptic number.

It is an amenable number.

21221301301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221301301 is an equidigital number, since it uses as much as digits as its factorization.

21221301301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21221301301 its reverse (10310312212), we get a palindrome (31531613513).

The spelling of 21221301301 in words is "twenty-one billion, two hundred twenty-one million, three hundred one thousand, three hundred one".