21002123112311 has 48 divisors (see below), whose sum is σ = 23593744263264. Its totient is φ = 18676614528000.

The previous prime is 21002123112307. The next prime is 21002123112391. The reversal of 21002123112311 is 11321132120012.

It is not a de Polignac number, because 21002123112311 - 2² = 21002123112307 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 (21002123112391) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1417044281 + ... + 1417059101.

It is an arithmetic number, because the mean of its divisors is an integer number (491536338818).

Almost surely, 2^{21002123112311} is an apocalyptic number.

21002123112311 is a deficient number, since it is larger than the sum of its proper divisors (2591621150953).

21002123112311 is a wasteful number, since it uses less digits than its factorization.

21002123112311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16224 (or 16213 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21002123112311 its reverse (11321132120012), we get a palindrome (32323255232323).

It can be divided in two parts, 210021 and 23112311, that added together give a palindrome (23322332).

The spelling of 21002123112311 in words is "twenty-one trillion, two billion, one hundred twenty-three million, one hundred twelve thousand, three hundred eleven".