81035143212 has 24 divisors (see below), whose sum is σ = 189095264176. Its totient is φ = 27009819648.

The previous prime is 81035143199. The next prime is 81035143219. The reversal of 81035143212 is 21234153018.

It is a self number, because there is not a number n which added to its sum of digits gives 81035143212.

It is not an unprimeable number, because it can be changed into a prime (81035143219) 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, 52933 + ... + 406044.

Almost surely, 2^81035143212 is an apocalyptic number.

It is an amenable number.

81035143212 is an abundant number, since it is smaller than the sum of its proper divisors (108060120964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81035143212 is a wasteful number, since it uses less digits than its factorization.

81035143212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473697 (or 473695 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 81035143212 in words is "eighty-one billion, thirty-five million, one hundred forty-three thousand, two hundred twelve".