1001313212021 has 4 divisors (see below), whose sum is σ = 1001357798700. Its totient is φ = 1001268625344.

The previous prime is 1001313212017. The next prime is 1001313212033. The reversal of 1001313212021 is 1202123131001.

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 447345607921 + 553967604100 = 668839^2 + 744290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001313212021 - 2² = 1001313212017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001313212071) 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, 22259636 + ... + 22304573.

It is an arithmetic number, because the mean of its divisors is an integer number (250339449675).

Almost surely, 2^{1001313212021} is an apocalyptic number.

It is an amenable number.

1001313212021 is a deficient number, since it is larger than the sum of its proper divisors (44586679).

1001313212021 is an equidigital number, since it uses as much as digits as its factorization.

1001313212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44586678.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1001313212021 its reverse (1202123131001), we get a palindrome (2203436343022).

The spelling of 1001313212021 in words is "one trillion, one billion, three hundred thirteen million, two hundred twelve thousand, twenty-one".