21220012201 has 2 divisors, whose sum is σ = 21220012202. Its totient is φ = 21220012200.

The previous prime is 21220012183. The next prime is 21220012207. The reversal of 21220012201 is 10221002212.

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., 19306824601 + 1913187600 = 138949^2 + 43740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220012201 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220012207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006100 + 10610006101.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006101).

Almost surely, 2^21220012201 is an apocalyptic number.

It is an amenable number.

21220012201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012201 is an equidigital number, since it uses as much as digits as its factorization.

21220012201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220012201 its reverse (10221002212), we get a palindrome (31441014413).

The spelling of 21220012201 in words is "twenty-one billion, two hundred twenty million, twelve thousand, two hundred one".