81025994421120 has 384 divisors, whose sum is σ = 310128471705600. Its totient is φ = 17922799964160.

The previous prime is 81025994421037. The next prime is 81025994421139. The reversal of 81025994421120 is 2112449952018.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 81025994421120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10974580 + ... + 16807539.

It is an arithmetic number, because the mean of its divisors is an integer number (807626228400).

Almost surely, 2^{81025994421120} is an apocalyptic number.

81025994421120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81025994421120 is an abundant number, since it is smaller than the sum of its proper divisors (229102477284480).

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

81025994421120 is a wasteful number, since it uses less digits than its factorization.

81025994421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27782186 (or 27782167 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 81025994421120 in words is "eighty-one trillion, twenty-five billion, nine hundred ninety-four million, four hundred twenty-one thousand, one hundred twenty".