3188428021 has 2 divisors, whose sum is σ = 3188428022. Its totient is φ = 3188428020.

The previous prime is 3188427929. The next prime is 3188428037. The reversal of 3188428021 is 1208248813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1983366225 + 1205061796 = 44535^2 + 34714^2 .

It is a cyclic number.

It is not a de Polignac number, because 3188428021 - 2²¹ = 3186330869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3188428921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1594214010 + 1594214011.

It is an arithmetic number, because the mean of its divisors is an integer number (1594214011).

Almost surely, 2^3188428021 is an apocalyptic number.

It is an amenable number.

3188428021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3188428021 is an equidigital number, since it uses as much as digits as its factorization.

3188428021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 3188428021 is about 56466.1670471797. The cubic root of 3188428021 is about 1471.8341399854.

The spelling of 3188428021 in words is "three billion, one hundred eighty-eight million, four hundred twenty-eight thousand, twenty-one".