2020081621 has 2 divisors, whose sum is σ = 2020081622. Its totient is φ = 2020081620.

The previous prime is 2020081601. The next prime is 2020081633. The reversal of 2020081621 is 1261800202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1450543396 + 569538225 = 38086^2 + 23865^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020081621 - 2⁷ = 2020081493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2020081592 and 2020081601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020081601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010040810 + 1010040811.

It is an arithmetic number, because the mean of its divisors is an integer number (1010040811).

Almost surely, 2^2020081621 is an apocalyptic number.

It is an amenable number.

2020081621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020081621 is an equidigital number, since it uses as much as digits as its factorization.

2020081621 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.

The square root of 2020081621 is about 44945.3181210235. The cubic root of 2020081621 is about 1264.1238906515.

Adding to 2020081621 its reverse (1261800202), we get a palindrome (3281881823).

The spelling of 2020081621 in words is "two billion, twenty million, eighty-one thousand, six hundred twenty-one".