2021011111213 has 2 divisors, whose sum is σ = 2021011111214. Its totient is φ = 2021011111212.

The previous prime is 2021011111183. The next prime is 2021011111237. The reversal of 2021011111213 is 3121111101202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1695196188009 + 325814923204 = 1301997^2 + 570802^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021011111213 - 2¹⁷ = 2021010980141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021011111813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010505555606 + 1010505555607.

It is an arithmetic number, because the mean of its divisors is an integer number (1010505555607).

Almost surely, 2^{2021011111213} is an apocalyptic number.

It is an amenable number.

2021011111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021011111213 is an equidigital number, since it uses as much as digits as its factorization.

2021011111213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 2021011111213 its reverse (3121111101202), we get a palindrome (5142122212415).

The spelling of 2021011111213 in words is "two trillion, twenty-one billion, eleven million, one hundred eleven thousand, two hundred thirteen".