6920590021 has 2 divisors, whose sum is σ = 6920590022. Its totient is φ = 6920590020.

The previous prime is 6920590013. The next prime is 6920590051. The reversal of 6920590021 is 1200950296.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4500933921 + 2419656100 = 67089^2 + 49190^2 .

It is a cyclic number.

It is not a de Polignac number, because 6920590021 - 2³ = 6920590013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6920590051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460295010 + 3460295011.

It is an arithmetic number, because the mean of its divisors is an integer number (3460295011).

Almost surely, 2^6920590021 is an apocalyptic number.

It is an amenable number.

6920590021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920590021 is an equidigital number, since it uses as much as digits as its factorization.

6920590021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 6920590021 is about 83190.0836698702. The cubic root of 6920590021 is about 1905.6700449745.

The spelling of 6920590021 in words is "six billion, nine hundred twenty million, five hundred ninety thousand, twenty-one".