861342921 has 12 divisors (see below), whose sum is σ = 1244970480. Its totient is φ = 573855480.

The previous prime is 861342907. The next prime is 861342929. The reversal of 861342921 is 129243168.

861342921 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 861342921 - 2¹¹ = 861340873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (861342929) 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, 16095 + ... + 44516.

It is an arithmetic number, because the mean of its divisors is an integer number (103747540).

Almost surely, 2^861342921 is an apocalyptic number.

It is an amenable number.

861342921 is a deficient number, since it is larger than the sum of its proper divisors (383627559).

861342921 is a wasteful number, since it uses less digits than its factorization.

861342921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62196 (or 62193 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 861342921 is about 29348.6442787397. The cubic root of 861342921 is about 951.4632744327.

The spelling of 861342921 in words is "eight hundred sixty-one million, three hundred forty-two thousand, nine hundred twenty-one".