21001202101201 has 12 divisors (see below), whose sum is σ = 25715757676080. Its totient is φ = 17053607720520.

The previous prime is 21001202101189. The next prime is 21001202101283. The reversal of 21001202101201 is 10210120210012.

It is not a de Polignac number, because 21001202101201 - 2⁹ = 21001202100689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001202101291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11278840155 + ... + 11278842016.

It is an arithmetic number, because the mean of its divisors is an integer number (2142979806340).

Almost surely, 2^{21001202101201} is an apocalyptic number.

It is an amenable number.

21001202101201 is a deficient number, since it is larger than the sum of its proper divisors (4714555574879).

21001202101201 is a wasteful number, since it uses less digits than its factorization.

21001202101201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22557682204 (or 22557682197 counting only the distinct ones).

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

Adding to 21001202101201 its reverse (10210120210012), we get a palindrome (31211322311213).

The spelling of 21001202101201 in words is "twenty-one trillion, one billion, two hundred two million, one hundred one thousand, two hundred one".