2021121210113 has 4 divisors (see below), whose sum is σ = 2021195880660. Its totient is φ = 2021046539568.

The previous prime is 2021121210103. The next prime is 2021121210151. The reversal of 2021121210113 is 3110121211202.

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 1483580028529 + 537541181584 = 1218023^2 + 733172^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121210113 - 2¹² = 2021121206017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021121210091 and 2021121210100.

It is not an unprimeable number, because it can be changed into a prime (2021121210103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37294658 + ... + 37348811.

It is an arithmetic number, because the mean of its divisors is an integer number (505298970165).

Almost surely, 2^{2021121210113} is an apocalyptic number.

It is an amenable number.

2021121210113 is a deficient number, since it is larger than the sum of its proper divisors (74670547).

2021121210113 is an equidigital number, since it uses as much as digits as its factorization.

2021121210113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74670546.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2021121210113 its reverse (3110121211202), we get a palindrome (5131242421315).

The spelling of 2021121210113 in words is "two trillion, twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred thirteen".