12021320311 has 64 divisors (see below), whose sum is σ = 17033748480. Its totient is φ = 8170554240.

The previous prime is 12021320309. The next prime is 12021320317. The reversal of 12021320311 is 11302312021.

It is a cyclic number.

It is not a de Polignac number, because 12021320311 - 2¹ = 12021320309 is a prime.

It is a super-2 number, since 2×12021320311² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021320317) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12228726 + ... + 12229708.

It is an arithmetic number, because the mean of its divisors is an integer number (266152320).

Almost surely, 2^12021320311 is an apocalyptic number.

12021320311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12021320311 is a deficient number, since it is larger than the sum of its proper divisors (5012428169).

12021320311 is a wasteful number, since it uses less digits than its factorization.

12021320311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12021320311 its reverse (11302312021), we get a palindrome (23323632332).

The spelling of 12021320311 in words is "twelve billion, twenty-one million, three hundred twenty thousand, three hundred eleven".