2021541421 has 2 divisors, whose sum is σ = 2021541422. Its totient is φ = 2021541420.

The previous prime is 2021541419. The next prime is 2021541437. The reversal of 2021541421 is 1241451202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1707755625 + 313785796 = 41325^2 + 17714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021541421 - 2¹ = 2021541419 is a prime.

Together with 2021541419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2021541392 and 2021541401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021541481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010770710 + 1010770711.

It is an arithmetic number, because the mean of its divisors is an integer number (1010770711).

Almost surely, 2^2021541421 is an apocalyptic number.

It is an amenable number.

2021541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021541421 is an equidigital number, since it uses as much as digits as its factorization.

2021541421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2021541421 is about 44961.5549219553. The cubic root of 2021541421 is about 1264.4283212085.

Adding to 2021541421 its reverse (1241451202), we get a palindrome (3262992623).

The spelling of 2021541421 in words is "two billion, twenty-one million, five hundred forty-one thousand, four hundred twenty-one".