755005021 has 2 divisors, whose sum is σ = 755005022. Its totient is φ = 755005020.

The previous prime is 755005019. The next prime is 755005057. The reversal of 755005021 is 120500557.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445632100 + 309372921 = 21110^2 + 17589^2 .

It is an emirp because it is prime and its reverse (120500557) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 755005021 - 2¹ = 755005019 is a prime.

Together with 755005019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (755005081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 377502510 + 377502511.

It is an arithmetic number, because the mean of its divisors is an integer number (377502511).

Almost surely, 2^755005021 is an apocalyptic number.

It is an amenable number.

755005021 is a deficient number, since it is larger than the sum of its proper divisors (1).

755005021 is an equidigital number, since it uses as much as digits as its factorization.

755005021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 755005021 is about 27477.3546943660. The cubic root of 755005021 is about 910.5768676604.

Adding to 755005021 its reverse (120500557), we get a palindrome (875505578).

The spelling of 755005021 in words is "seven hundred fifty-five million, five thousand, twenty-one".