21002110221211 has 16 divisors (see below), whose sum is σ = 25292376380160. Its totient is φ = 17036336227680.

The previous prime is 21002110221193. The next prime is 21002110221277. The reversal of 21002110221211 is 11212201120012.

It is not a de Polignac number, because 21002110221211 - 2⁴¹ = 18803086965659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002110221011) 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, 83248180 + ... + 83500081.

It is an arithmetic number, because the mean of its divisors is an integer number (1580773523760).

Almost surely, 2^{21002110221211} is an apocalyptic number.

21002110221211 is a deficient number, since it is larger than the sum of its proper divisors (4290266158949).

21002110221211 is a wasteful number, since it uses less digits than its factorization.

21002110221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166749234.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21002110221211 its reverse (11212201120012), we get a palindrome (32214311341223).

The spelling of 21002110221211 in words is "twenty-one trillion, two billion, one hundred ten million, two hundred twenty-one thousand, two hundred eleven".