21001222301 has 2 divisors, whose sum is σ = 21001222302. Its totient is φ = 21001222300.

The previous prime is 21001222267. The next prime is 21001222309. The reversal of 21001222301 is 10322210012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18711504100 + 2289718201 = 136790^2 + 47851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001222301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001222309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500611150 + 10500611151.

It is an arithmetic number, because the mean of its divisors is an integer number (10500611151).

Almost surely, 2^21001222301 is an apocalyptic number.

It is an amenable number.

21001222301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001222301 is an equidigital number, since it uses as much as digits as its factorization.

21001222301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21001222301 its reverse (10322210012), we get a palindrome (31323432313).

The spelling of 21001222301 in words is "twenty-one billion, one million, two hundred twenty-two thousand, three hundred one".