769021021 has 4 divisors (see below), whose sum is σ = 769949500. Its totient is φ = 768092544.

The previous prime is 769021009. The next prime is 769021039. The reversal of 769021021 is 120120967.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 435556900 + 333464121 = 20870^2 + 18261^2 .

It is a cyclic number.

It is not a de Polignac number, because 769021021 - 2⁹ = 769020509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (769021081) 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, 462996 + ... + 464653.

It is an arithmetic number, because the mean of its divisors is an integer number (192487375).

Almost surely, 2^769021021 is an apocalyptic number.

It is an amenable number.

769021021 is a deficient number, since it is larger than the sum of its proper divisors (928479).

769021021 is an equidigital number, since it uses as much as digits as its factorization.

769021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928478.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 769021021 is about 27731.2282634578. The cubic root of 769021021 is about 916.1770397779.

Adding to 769021021 its reverse (120120967), we get a palindrome (889141988).

The spelling of 769021021 in words is "seven hundred sixty-nine million, twenty-one thousand, twenty-one".