755940021 has 4 divisors (see below), whose sum is σ = 1007920032. Its totient is φ = 503960012.

The previous prime is 755939993. The next prime is 755940041. The reversal of 755940021 is 120049557.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 755940021 - 2¹⁹ = 755415733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (755940041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125990001 + ... + 125990006.

It is an arithmetic number, because the mean of its divisors is an integer number (251980008).

Almost surely, 2^755940021 is an apocalyptic number.

It is an amenable number.

755940021 is a deficient number, since it is larger than the sum of its proper divisors (251980011).

755940021 is a wasteful number, since it uses less digits than its factorization.

755940021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251980010.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 755940021 is about 27494.3634405309. The cubic root of 755940021 is about 910.9525994480.

Adding to 755940021 its reverse (120049557), we get a palindrome (875989578).

The spelling of 755940021 in words is "seven hundred fifty-five million, nine hundred forty thousand, twenty-one".