81220110222 has 16 divisors (see below), whose sum is σ = 162461249280. Its totient is φ = 27069865272.

The previous prime is 81220110221. The next prime is 81220110227. The reversal of 81220110222 is 22201102218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81220110221) 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 7 ways as a sum of consecutive naturals, for example, 825768 + ... + 918875.

It is an arithmetic number, because the mean of its divisors is an integer number (10153828080).

Almost surely, 2^81220110222 is an apocalyptic number.

81220110222 is an abundant number, since it is smaller than the sum of its proper divisors (81241139058).

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

81220110222 is a wasteful number, since it uses less digits than its factorization.

81220110222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752407.

The product of its (nonzero) digits is 256, while the sum is 21.

The spelling of 81220110222 in words is "eighty-one billion, two hundred twenty million, one hundred ten thousand, two hundred twenty-two".