21112132111321 has 4 divisors (see below), whose sum is σ = 21246604290532. Its totient is φ = 20977659932112.

The previous prime is 21112132111267. The next prime is 21112132111331. The reversal of 21112132111321 is 12311123121112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3952124120025 + 17160007991296 = 1987995^2 + 4142464^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112132111321 - 2¹³ = 21112132103129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112132111292 and 21112132111301.

It is not an unprimeable number, because it can be changed into a prime (21112132111331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67236089370 + ... + 67236089683.

It is an arithmetic number, because the mean of its divisors is an integer number (5311651072633).

Almost surely, 2^{21112132111321} is an apocalyptic number.

It is an amenable number.

21112132111321 is a deficient number, since it is larger than the sum of its proper divisors (134472179211).

21112132111321 is a wasteful number, since it uses less digits than its factorization.

21112132111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134472179210.

The product of its digits is 144, while the sum is 22.

Adding to 21112132111321 its reverse (12311123121112), we get a palindrome (33423255232433).

The spelling of 21112132111321 in words is "twenty-one trillion, one hundred twelve billion, one hundred thirty-two million, one hundred eleven thousand, three hundred twenty-one".