6821400681 has 12 divisors (see below), whose sum is σ = 9870397680. Its totient is φ = 4539632760.

The previous prime is 6821400661. The next prime is 6821400709. The reversal of 6821400681 is 1860041286.

It is not a de Polignac number, because 6821400681 - 2¹⁰ = 6821399657 is a prime.

It is a super-2 number, since 2×6821400681² = 93063014501494527522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6821400661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 658551 + ... + 668828.

It is an arithmetic number, because the mean of its divisors is an integer number (822533140).

Almost surely, 2^6821400681 is an apocalyptic number.

It is an amenable number.

6821400681 is a deficient number, since it is larger than the sum of its proper divisors (3048996999).

6821400681 is a wasteful number, since it uses less digits than its factorization.

6821400681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327956 (or 1327953 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 6821400681 is about 82591.7712668762. The cubic root of 6821400681 is about 1896.5218622026.

The spelling of 6821400681 in words is "six billion, eight hundred twenty-one million, four hundred thousand, six hundred eighty-one".