2111201021321 has 24 divisors (see below), whose sum is σ = 2479326229800. Its totient is φ = 1792388677632.

The previous prime is 2111201021297. The next prime is 2111201021323. The reversal of 2111201021321 is 1231201021112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 881841196096 + 1229359825225 = 939064^2 + 1108765^2 .

It is not a de Polignac number, because 2111201021321 - 2³⁸ = 1836323114377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111201021321.

It is not an unprimeable number, because it can be changed into a prime (2111201021323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2663921 + ... + 3364353.

It is an arithmetic number, because the mean of its divisors is an integer number (103305259575).

Almost surely, 2^{2111201021321} is an apocalyptic number.

It is an amenable number.

2111201021321 is a deficient number, since it is larger than the sum of its proper divisors (368125208479).

2111201021321 is a wasteful number, since it uses less digits than its factorization.

2111201021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701033 (or 701026 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2111201021321 its reverse (1231201021112), we get a palindrome (3342402042433).

The spelling of 2111201021321 in words is "two trillion, one hundred eleven billion, two hundred one million, twenty-one thousand, three hundred twenty-one".