2020155421 has 2 divisors, whose sum is σ = 2020155422. Its totient is φ = 2020155420.

The previous prime is 2020155383. The next prime is 2020155433. The reversal of 2020155421 is 1245510202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1961249796 + 58905625 = 44286^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020155421 - 2²¹ = 2018058269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2020155392 and 2020155401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020155461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010077710 + 1010077711.

It is an arithmetic number, because the mean of its divisors is an integer number (1010077711).

Almost surely, 2^2020155421 is an apocalyptic number.

It is an amenable number.

2020155421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020155421 is an equidigital number, since it uses as much as digits as its factorization.

2020155421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2020155421 is about 44946.1391111628. The cubic root of 2020155421 is about 1264.1392846181.

Adding to 2020155421 its reverse (1245510202), we get a palindrome (3265665623).

The spelling of 2020155421 in words is "two billion, twenty million, one hundred fifty-five thousand, four hundred twenty-one".