676140021 has 8 divisors (see below), whose sum is σ = 1001688960. Its totient is φ = 450759996.

The previous prime is 676140013. The next prime is 676140053. The reversal of 676140021 is 120041676.

676140021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 676140021 - 2³ = 676140013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 25042223 = 676140021 / (6 + 7 + 6 + 1 + 4 + 0 + 0 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (676140011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12521085 + ... + 12521138.

It is an arithmetic number, because the mean of its divisors is an integer number (125211120).

Almost surely, 2^676140021 is an apocalyptic number.

It is an amenable number.

676140021 is a deficient number, since it is larger than the sum of its proper divisors (325548939).

676140021 is a wasteful number, since it uses less digits than its factorization.

676140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25042232 (or 25042226 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 676140021 is about 26002.6925721164. The cubic root of 676140021 is about 877.6988869077.

Adding to 676140021 its reverse (120041676), we get a palindrome (796181697).

The spelling of 676140021 in words is "six hundred seventy-six million, one hundred forty thousand, twenty-one".