2021013723613 has 2 divisors, whose sum is σ = 2021013723614. Its totient is φ = 2021013723612.

The previous prime is 2021013723607. The next prime is 2021013723679. The reversal of 2021013723613 is 3163273101202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1667747536569 + 353266187044 = 1291413^2 + 594362^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021013723613 - 2⁵ = 2021013723581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021013727613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010506861806 + 1010506861807.

It is an arithmetic number, because the mean of its divisors is an integer number (1010506861807).

Almost surely, 2^{2021013723613} is an apocalyptic number.

It is an amenable number.

2021013723613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021013723613 is an equidigital number, since it uses as much as digits as its factorization.

2021013723613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 2021013723613 its reverse (3163273101202), we get a palindrome (5184286824815).

The spelling of 2021013723613 in words is "two trillion, twenty-one billion, thirteen million, seven hundred twenty-three thousand, six hundred thirteen".