861882107921 has 8 divisors (see below), whose sum is σ = 899368621440. Its totient is φ = 824396709312.

The previous prime is 861882107909. The next prime is 861882107969. The reversal of 861882107921 is 129701288168.

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 861882107921 - 2¹⁸ = 861881845777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861882107321) 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, 1558820 + ... + 2038058.

It is an arithmetic number, because the mean of its divisors is an integer number (112421077680).

Almost surely, 2^861882107921 is an apocalyptic number.

It is an amenable number.

861882107921 is a deficient number, since it is larger than the sum of its proper divisors (37486513519).

861882107921 is a wasteful number, since it uses less digits than its factorization.

861882107921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557455.

The product of its (nonzero) digits is 774144, while the sum is 53.

The spelling of 861882107921 in words is "eight hundred sixty-one billion, eight hundred eighty-two million, one hundred seven thousand, nine hundred twenty-one".