5128021 has 2 divisors, whose sum is σ = 5128022. Its totient is φ = 5128020.

The previous prime is 5128007. The next prime is 5128027. The reversal of 5128021 is 1208215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4622500 + 505521 = 2150^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 5128021 - 2¹⁷ = 4996949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5128021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5128027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564010 + 2564011.

It is an arithmetic number, because the mean of its divisors is an integer number (2564011).

Almost surely, 2^5128021 is an apocalyptic number.

It is an amenable number.

5128021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128021 is an equidigital number, since it uses as much as digits as its factorization.

5128021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 5128021 is about 2264.5134135173. The cubic root of 5128021 is about 172.4447319968. Note that the first 3 decimals are identical.

The spelling of 5128021 in words is "five million, one hundred twenty-eight thousand, twenty-one".