2021120201521 has 2 divisors, whose sum is σ = 2021120201522. Its totient is φ = 2021120201520.

The previous prime is 2021120201509. The next prime is 2021120201543. The reversal of 2021120201521 is 1251020211202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234109919025 + 787010282496 = 1110905^2 + 887136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021120201521 - 2⁷ = 2021120201393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2021120201561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560100760 + 1010560100761.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560100761).

Almost surely, 2^{2021120201521} is an apocalyptic number.

It is an amenable number.

2021120201521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021120201521 is an equidigital number, since it uses as much as digits as its factorization.

2021120201521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 2021120201521 its reverse (1251020211202), we get a palindrome (3272140412723).

The spelling of 2021120201521 in words is "two trillion, twenty-one billion, one hundred twenty million, two hundred one thousand, five hundred twenty-one".