81212330894 has 64 divisors (see below), whose sum is σ = 130094173440. Its totient is φ = 37968860160.

The previous prime is 81212330873. The next prime is 81212330909. The reversal of 81212330894 is 49803321218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87418622 + ... + 87419550.

It is an arithmetic number, because the mean of its divisors is an integer number (2032721460).

Almost surely, 2^81212330894 is an apocalyptic number.

81212330894 is a deficient number, since it is larger than the sum of its proper divisors (48881842546).

81212330894 is a wasteful number, since it uses less digits than its factorization.

81212330894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 81212330894 in words is "eighty-one billion, two hundred twelve million, three hundred thirty thousand, eight hundred ninety-four".