81130221023101 has 16 divisors (see below), whose sum is σ = 85224596341248. Its totient is φ = 77138627572800.

The previous prime is 81130221023077. The next prime is 81130221023153. The reversal of 81130221023101 is 10132012203118.

It is a cyclic number.

It is not a de Polignac number, because 81130221023101 - 2³⁷ = 80992782069629 is a prime.

It is a super-2 number, since 2×81130221023101² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130221023171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86637526 + ... + 87568951.

It is an arithmetic number, because the mean of its divisors is an integer number (5326537271328).

Almost surely, 2^{81130221023101} is an apocalyptic number.

It is an amenable number.

81130221023101 is a deficient number, since it is larger than the sum of its proper divisors (4094375318147).

81130221023101 is a wasteful number, since it uses less digits than its factorization.

81130221023101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174206772.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 81130221023101 its reverse (10132012203118), we get a palindrome (91262233226219).

The spelling of 81130221023101 in words is "eighty-one trillion, one hundred thirty billion, two hundred twenty-one million, twenty-three thousand, one hundred one".