681374983421 has 16 divisors (see below), whose sum is σ = 761858009088. Its totient is φ = 604029409200.

The previous prime is 681374983397. The next prime is 681374983453. The reversal of 681374983421 is 124389473186.

It is a cyclic number.

It is not a de Polignac number, because 681374983421 - 2²² = 681370789117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681374983621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 899495 + ... + 1473716.

It is an arithmetic number, because the mean of its divisors is an integer number (47616125568).

Almost surely, 2^681374983421 is an apocalyptic number.

It is an amenable number.

681374983421 is a deficient number, since it is larger than the sum of its proper divisors (80483025667).

681374983421 is a wasteful number, since it uses less digits than its factorization.

681374983421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373872.

The product of its digits is 6967296, while the sum is 56.

The spelling of 681374983421 in words is "six hundred eighty-one billion, three hundred seventy-four million, nine hundred eighty-three thousand, four hundred twenty-one".