21002220311 has 4 divisors (see below), whose sum is σ = 21002581152. Its totient is φ = 21001859472.

The previous prime is 21002220293. The next prime is 21002220319. The reversal of 21002220311 is 11302220012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21002220311 - 2¹⁴ = 21002203927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002220319) 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, 70991 + ... + 216896.

It is an arithmetic number, because the mean of its divisors is an integer number (5250645288).

Almost surely, 2^21002220311 is an apocalyptic number.

21002220311 is a deficient number, since it is larger than the sum of its proper divisors (360841).

21002220311 is an equidigital number, since it uses as much as digits as its factorization.

21002220311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360840.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21002220311 its reverse (11302220012), we get a palindrome (32304440323).

The spelling of 21002220311 in words is "twenty-one billion, two million, two hundred twenty thousand, three hundred eleven".