21201112601 has 2 divisors, whose sum is σ = 21201112602. Its totient is φ = 21201112600.

The previous prime is 21201112579. The next prime is 21201112609. The reversal of 21201112601 is 10621110212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20010931600 + 1190181001 = 141460^2 + 34499^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201112601 - 2³⁰ = 20127370777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201112601.

It is not a weakly prime, because it can be changed into another prime (21201112609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600556300 + 10600556301.

It is an arithmetic number, because the mean of its divisors is an integer number (10600556301).

Almost surely, 2^21201112601 is an apocalyptic number.

It is an amenable number.

21201112601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201112601 is an equidigital number, since it uses as much as digits as its factorization.

21201112601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21201112601 its reverse (10621110212), we get a palindrome (31822222813).

The spelling of 21201112601 in words is "twenty-one billion, two hundred one million, one hundred twelve thousand, six hundred one".