2021201122621 has 2 divisors, whose sum is σ = 2021201122622. Its totient is φ = 2021201122620.

The previous prime is 2021201122609. The next prime is 2021201122649. The reversal of 2021201122621 is 1262211021202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1663878127396 + 357322995225 = 1289914^2 + 597765^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021201122621 - 2²⁹ = 2020664251709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021201122592 and 2021201122601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021201122021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010600561310 + 1010600561311.

It is an arithmetic number, because the mean of its divisors is an integer number (1010600561311).

Almost surely, 2^{2021201122621} is an apocalyptic number.

It is an amenable number.

2021201122621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021201122621 is an equidigital number, since it uses as much as digits as its factorization.

2021201122621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 2021201122621 its reverse (1262211021202), we get a palindrome (3283412143823).

The spelling of 2021201122621 in words is "two trillion, twenty-one billion, two hundred one million, one hundred twenty-two thousand, six hundred twenty-one".