101220111091 has 32 divisors (see below), whose sum is σ = 113318092800. Its totient is φ = 89640545280.

The previous prime is 101220111089. The next prime is 101220111107. The reversal of 101220111091 is 190111022101.

It is not a de Polignac number, because 101220111091 - 2¹ = 101220111089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101220115091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45862110 + ... + 45864316.

It is an arithmetic number, because the mean of its divisors is an integer number (3541190400).

Almost surely, 2^101220111091 is an apocalyptic number.

101220111091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

101220111091 is a deficient number, since it is larger than the sum of its proper divisors (12097981709).

101220111091 is a wasteful number, since it uses less digits than its factorization.

101220111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 101220111091 its reverse (190111022101), we get a palindrome (291331133192).

The spelling of 101220111091 in words is "one hundred one billion, two hundred twenty million, one hundred eleven thousand, ninety-one".