86781804052821 has 16 divisors (see below), whose sum is σ = 115768431787008. Its totient is φ = 57824858559600.

The previous prime is 86781804052817. The next prime is 86781804052891. The reversal of 86781804052821 is 12825040818768.

It is a happy number.

It is not a de Polignac number, because 86781804052821 - 2² = 86781804052817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86781804052891) 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, 152041156 + ... + 152610866.

It is an arithmetic number, because the mean of its divisors is an integer number (7235526986688).

Almost surely, 2^{86781804052821} is an apocalyptic number.

It is an amenable number.

86781804052821 is a deficient number, since it is larger than the sum of its proper divisors (28986627734187).

86781804052821 is a wasteful number, since it uses less digits than its factorization.

86781804052821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595672.

The product of its (nonzero) digits is 13762560, while the sum is 60.

The spelling of 86781804052821 in words is "eighty-six trillion, seven hundred eighty-one billion, eight hundred four million, fifty-two thousand, eight hundred twenty-one".