81102496212 has 48 divisors (see below), whose sum is σ = 212347598400. Its totient is φ = 26766496800.

The previous prime is 81102496193. The next prime is 81102496217. The reversal of 81102496212 is 21269420118.

81102496212 is a `hidden beast` number, since 8 + 1 + 1 + 0 + 24 + 9 + 621 + 2 = 666.

It is a super-2 number, since 2×81102496212² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81102496217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3706662 + ... + 3728477.

It is an arithmetic number, because the mean of its divisors is an integer number (4423908300).

Almost surely, 2^81102496212 is an apocalyptic number.

It is an amenable number.

81102496212 is an abundant number, since it is smaller than the sum of its proper divisors (131245102188).

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

81102496212 is a wasteful number, since it uses less digits than its factorization.

81102496212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7435253 (or 7435245 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 81102496212 in words is "eighty-one billion, one hundred two million, four hundred ninety-six thousand, two hundred twelve".