2121021021331 has 4 divisors (see below), whose sum is σ = 2129274021672. Its totient is φ = 2112768020992.

The previous prime is 2121021021319. The next prime is 2121021021367. The reversal of 2121021021331 is 1331201201212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121021021331 - 2¹¹ = 2121021019283 is a prime.

It is a super-2 number, since 2×2121021021331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121021021299 and 2121021021308.

It is not an unprimeable number, because it can be changed into a prime (2121021021731) 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, 4126499785 + ... + 4126500298.

It is an arithmetic number, because the mean of its divisors is an integer number (532318505418).

Almost surely, 2^{2121021021331} is an apocalyptic number.

2121021021331 is a deficient number, since it is larger than the sum of its proper divisors (8253000341).

2121021021331 is an equidigital number, since it uses as much as digits as its factorization.

2121021021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8253000340.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2121021021331 its reverse (1331201201212), we get a palindrome (3452222222543).

The spelling of 2121021021331 in words is "two trillion, one hundred twenty-one billion, twenty-one million, twenty-one thousand, three hundred thirty-one".