81062110021 has 16 divisors (see below), whose sum is σ = 86168145600. Its totient is φ = 75994184448.

The previous prime is 81062109983. The next prime is 81062110057. The reversal of 81062110021 is 12001126018.

It is not a de Polignac number, because 81062110021 - 2⁷ = 81062109893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81062109974 and 81062110001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81062110121) 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, 4652995 + ... + 4670383.

It is an arithmetic number, because the mean of its divisors is an integer number (5385509100).

Almost surely, 2^81062110021 is an apocalyptic number.

It is an amenable number.

81062110021 is a deficient number, since it is larger than the sum of its proper divisors (5106035579).

81062110021 is a wasteful number, since it uses less digits than its factorization.

81062110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18468.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 81062110021 its reverse (12001126018), we get a palindrome (93063236039).

The spelling of 81062110021 in words is "eighty-one billion, sixty-two million, one hundred ten thousand, twenty-one".