861803541021 has 8 divisors (see below), whose sum is σ = 1149284476800. Its totient is φ = 574429149632.

The previous prime is 861803540999. The next prime is 861803541029. The reversal of 861803541021 is 120145308168.

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 861803541021 - 2⁵ = 861803540989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861803541029) 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, 26617221 + ... + 26649578.

It is an arithmetic number, because the mean of its divisors is an integer number (143660559600).

Almost surely, 2^861803541021 is an apocalyptic number.

It is an amenable number.

861803541021 is a deficient number, since it is larger than the sum of its proper divisors (287480935779).

861803541021 is a wasteful number, since it uses less digits than its factorization.

861803541021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53272195.

The product of its (nonzero) digits is 46080, while the sum is 39.

Adding to 861803541021 its reverse (120145308168), we get a palindrome (981948849189).

The spelling of 861803541021 in words is "eight hundred sixty-one billion, eight hundred three million, five hundred forty-one thousand, twenty-one".