81321094000 has 40 divisors (see below), whose sum is σ = 196634410128. Its totient is φ = 32528436800.

The previous prime is 81321093983. The next prime is 81321094027. The reversal of 81321094000 is 49012318.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×81321094000² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81321094000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20328274 + ... + 20332273.

Almost surely, 2^81321094000 is an apocalyptic number.

81321094000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81321094000 is an abundant number, since it is smaller than the sum of its proper divisors (115313316128).

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

81321094000 is a wasteful number, since it uses less digits than its factorization.

81321094000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40660570 (or 40660554 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 81321094000 in words is "eighty-one billion, three hundred twenty-one million, ninety-four thousand".