81100221221022 has 32 divisors (see below), whose sum is σ = 162302284584960. Its totient is φ = 27016435569600.

The previous prime is 81100221221011. The next prime is 81100221221059. The reversal of 81100221221022 is 22012212200118.

It is a junction number, because it is equal to n+sod(n) for n = 81100221220983 and 81100221221001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152563929 + ... + 153094587.

It is an arithmetic number, because the mean of its divisors is an integer number (5071946393280).

Almost surely, 2^{81100221221022} is an apocalyptic number.

81100221221022 is an abundant number, since it is smaller than the sum of its proper divisors (81202063363938).

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

81100221221022 is a wasteful number, since it uses less digits than its factorization.

81100221221022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546608.

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 81100221221022 in words is "eighty-one trillion, one hundred billion, two hundred twenty-one million, two hundred twenty-one thousand, twenty-two".