81142253222141 has 8 divisors (see below), whose sum is σ = 81182691313920. Its totient is φ = 81101816313232.

The previous prime is 81142253222137. The next prime is 81142253222207. The reversal of 81142253222141 is 14122235224118.

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 81142253222141 - 2² = 81142253222137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81142253222095 and 81142253222104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81142253222111) 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, 157945496 + ... + 158458398.

It is an arithmetic number, because the mean of its divisors is an integer number (10147836414240).

Almost surely, 2^{81142253222141} is an apocalyptic number.

It is an amenable number.

81142253222141 is a deficient number, since it is larger than the sum of its proper divisors (40438091779).

81142253222141 is a wasteful number, since it uses less digits than its factorization.

81142253222141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591435.

The product of its digits is 61440, while the sum is 38.

Adding to 81142253222141 its reverse (14122235224118), we get a palindrome (95264488446259).

The spelling of 81142253222141 in words is "eighty-one trillion, one hundred forty-two billion, two hundred fifty-three million, two hundred twenty-two thousand, one hundred forty-one".