21211102211201 has 4 divisors (see below), whose sum is σ = 24241259669952. Its totient is φ = 18180944752452.

The previous prime is 21211102211161. The next prime is 21211102211219. The reversal of 21211102211201 is 10211220111212.

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.

It is a cyclic number.

It is not a de Polignac number, because 21211102211201 - 2²⁶ = 21211035102337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211102211201.

It is not an unprimeable number, because it can be changed into a prime (21211102211261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515078729365 + ... + 1515078729378.

It is an arithmetic number, because the mean of its divisors is an integer number (6060314917488).

Almost surely, 2^{21211102211201} is an apocalyptic number.

It is an amenable number.

21211102211201 is a deficient number, since it is larger than the sum of its proper divisors (3030157458751).

21211102211201 is an equidigital number, since it uses as much as digits as its factorization.

21211102211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030157458750.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21211102211201 its reverse (10211220111212), we get a palindrome (31422322322413).

The spelling of 21211102211201 in words is "twenty-one trillion, two hundred eleven billion, one hundred two million, two hundred eleven thousand, two hundred one".