81112421242 has 8 divisors (see below), whose sum is σ = 121672244916. Its totient is φ = 40555006272.

The previous prime is 81112421239. The next prime is 81112421287. The reversal of 81112421242 is 24212421118.

It can be written as a sum of positive squares in 2 ways, for example, as 66439702081 + 14672719161 = 257759^2 + 121131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81112421242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515493 + ... + 654184.

Almost surely, 2^81112421242 is an apocalyptic number.

81112421242 is a deficient number, since it is larger than the sum of its proper divisors (40559823674).

81112421242 is a wasteful number, since it uses less digits than its factorization.

81112421242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204352.

The product of its digits is 2048, while the sum is 28.

The spelling of 81112421242 in words is "eighty-one billion, one hundred twelve million, four hundred twenty-one thousand, two hundred forty-two".