1306112122021 has 12 divisors (see below), whose sum is σ = 1540168002732. Its totient is φ = 1104188718528.

The previous prime is 1306112122019. The next prime is 1306112122033. The reversal of 1306112122021 is 1202212116031.

It can be written as a sum of positive squares in 2 ways, for example, as 704306992900 + 601805129121 = 839230^2 + 775761^2 .

It is not a de Polignac number, because 1306112122021 - 2¹ = 1306112122019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1306112121983 and 1306112122001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306112122321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182567310 + ... + 182574463.

It is an arithmetic number, because the mean of its divisors is an integer number (128347333561).

Almost surely, 2^{1306112122021} is an apocalyptic number.

It is an amenable number.

1306112122021 is a deficient number, since it is larger than the sum of its proper divisors (234055880711).

1306112122021 is an equidigital number, since it uses as much as digits as its factorization.

1306112122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365141860 (or 365141853 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1306112122021 its reverse (1202212116031), we get a palindrome (2508324238052).

The spelling of 1306112122021 in words is "one trillion, three hundred six billion, one hundred twelve million, one hundred twenty-two thousand, twenty-one".