21001122001201 has 4 divisors (see below), whose sum is σ = 21001131208512. Its totient is φ = 21001112793892.

The previous prime is 21001122001177. The next prime is 21001122001207. The reversal of 21001122001201 is 10210022110012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21001122001201 - 2⁴¹ = 18802098745649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001122001207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1643676 + ... + 6686098.

It is an arithmetic number, because the mean of its divisors is an integer number (5250282802128).

Almost surely, 2^{21001122001201} is an apocalyptic number.

It is an amenable number.

21001122001201 is a deficient number, since it is larger than the sum of its proper divisors (9207311).

21001122001201 is an equidigital number, since it uses as much as digits as its factorization.

21001122001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9207310.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001122001201 its reverse (10210022110012), we get a palindrome (31211144111213).

The spelling of 21001122001201 in words is "twenty-one trillion, one billion, one hundred twenty-two million, one thousand, two hundred one".