681205432921 has 8 divisors (see below), whose sum is σ = 737292315200. Its totient is φ = 625645188432.

The previous prime is 681205432913. The next prime is 681205432931. The reversal of 681205432921 is 129234502186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681205432921 - 2³ = 681205432913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681205432931) 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, 131656755 + ... + 131661928.

It is an arithmetic number, because the mean of its divisors is an integer number (92161539400).

Almost surely, 2^681205432921 is an apocalyptic number.

It is an amenable number.

681205432921 is a deficient number, since it is larger than the sum of its proper divisors (56086882279).

681205432921 is a wasteful number, since it uses less digits than its factorization.

681205432921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263318895.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 681205432921 in words is "six hundred eighty-one billion, two hundred five million, four hundred thirty-two thousand, nine hundred twenty-one".