81224118940 has 12 divisors (see below), whose sum is σ = 170570649816. Its totient is φ = 32489647568.

The previous prime is 81224118929. The next prime is 81224118949. The reversal of 81224118940 is 4981142218.

It is a junction number, because it is equal to n+sod(n) for n = 81224118893 and 81224118902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81224118949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2030602954 + ... + 2030602993.

It is an arithmetic number, because the mean of its divisors is an integer number (14214220818).

Almost surely, 2^81224118940 is an apocalyptic number.

It is an amenable number.

81224118940 is an abundant number, since it is smaller than the sum of its proper divisors (89346530876).

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

81224118940 is a wasteful number, since it uses less digits than its factorization.

81224118940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061205956 (or 4061205954 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 81224118940 in words is "eighty-one billion, two hundred twenty-four million, one hundred eighteen thousand, nine hundred forty".