1001210013121 has 4 divisors (see below), whose sum is σ = 1004931983700. Its totient is φ = 997488042544.

The previous prime is 1001210013073. The next prime is 1001210013149. The reversal of 1001210013121 is 1213100121001.

It is a happy number.

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 232747388721 + 768462624400 = 482439^2 + 876620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001210013121 - 2⁷ = 1001210012993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001210013421) 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, 1860984886 + ... + 1860985423.

It is an arithmetic number, because the mean of its divisors is an integer number (251232995925).

Almost surely, 2^{1001210013121} is an apocalyptic number.

It is an amenable number.

1001210013121 is a deficient number, since it is larger than the sum of its proper divisors (3721970579).

1001210013121 is an equidigital number, since it uses as much as digits as its factorization.

1001210013121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3721970578.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1001210013121 its reverse (1213100121001), we get a palindrome (2214310134122).

The spelling of 1001210013121 in words is "one trillion, one billion, two hundred ten million, thirteen thousand, one hundred twenty-one".