21002211211231 has 4 divisors (see below), whose sum is σ = 21002220694264. Its totient is φ = 21002201728200.

The previous prime is 21002211211199. The next prime is 21002211211291. The reversal of 21002211211231 is 13211211220012.

It is a semiprime because it is the product of two primes, 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 21002211211231 - 2⁵ = 21002211211199 is a prime.

It is a super-2 number, since 2×21002211211231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002211211199 and 21002211211208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002211211291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546076 + ... + 6504046.

It is an arithmetic number, because the mean of its divisors is an integer number (5250555173566).

Almost surely, 2^{21002211211231} is an apocalyptic number.

21002211211231 is a deficient number, since it is larger than the sum of its proper divisors (9483033).

21002211211231 is an equidigital number, since it uses as much as digits as its factorization.

21002211211231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9483032.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21002211211231 its reverse (13211211220012), we get a palindrome (34213422431243).

The spelling of 21002211211231 in words is "twenty-one trillion, two billion, two hundred eleven million, two hundred eleven thousand, two hundred thirty-one".