21002120012211 has 16 divisors (see below), whose sum is σ = 30157992545184. Its totient is φ = 12923909144064.

The previous prime is 21002120012189. The next prime is 21002120012213. The reversal of 21002120012211 is 11221002120012.

It is not a de Polignac number, because 21002120012211 - 2¹⁴ = 21002119995827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002120012213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8759526 + ... + 10896491.

It is an arithmetic number, because the mean of its divisors is an integer number (1884874534074).

Almost surely, 2^{21002120012211} is an apocalyptic number.

21002120012211 is a deficient number, since it is larger than the sum of its proper divisors (9155872532973).

21002120012211 is a wasteful number, since it uses less digits than its factorization.

21002120012211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19683430.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002120012211 its reverse (11221002120012), we get a palindrome (32223122132223).

The spelling of 21002120012211 in words is "twenty-one trillion, two billion, one hundred twenty million, twelve thousand, two hundred eleven".