755215421 has 2 divisors, whose sum is σ = 755215422. Its totient is φ = 755215420.

The previous prime is 755215403. The next prime is 755215451. The reversal of 755215421 is 124512557.

755215421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680479396 + 74736025 = 26086^2 + 8645^2 .

It is a cyclic number.

It is not a de Polignac number, because 755215421 - 2¹⁴ = 755199037 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (755215451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 377607710 + 377607711.

It is an arithmetic number, because the mean of its divisors is an integer number (377607711).

Almost surely, 2^755215421 is an apocalyptic number.

It is an amenable number.

755215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

755215421 is an equidigital number, since it uses as much as digits as its factorization.

755215421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14000, while the sum is 32.

The square root of 755215421 is about 27481.1830349423. The cubic root of 755215421 is about 910.6614443956.

Adding to 755215421 its reverse (124512557), we get a palindrome (879727978).

The spelling of 755215421 in words is "seven hundred fifty-five million, two hundred fifteen thousand, four hundred twenty-one".