81100221220983 has 16 divisors (see below), whose sum is σ = 108236214043776. Its totient is φ = 54015524456160.

The previous prime is 81100221220957. The next prime is 81100221221003. The reversal of 81100221220983 is 38902212200118.

It is not a de Polignac number, because 81100221220983 - 2²¹ = 81100219123831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81100221220583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106014285 + ... + 106776537.

It is an arithmetic number, because the mean of its divisors is an integer number (6764763377736).

Almost surely, 2^{81100221220983} is an apocalyptic number.

81100221220983 is a deficient number, since it is larger than the sum of its proper divisors (27135992822793).

81100221220983 is a wasteful number, since it uses less digits than its factorization.

81100221220983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795854.

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 81100221220983 in words is "eighty-one trillion, one hundred billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-three".