101220111220 has 12 divisors (see below), whose sum is σ = 212562233604. Its totient is φ = 40488044480.

The previous prime is 101220111217. The next prime is 101220111233. The reversal of 101220111220 is 22111022101.

It can be written as a sum of positive squares in 2 ways, for example, as 10958321124 + 90261790096 = 104682^2 + 300436^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101220111220.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2530502761 + ... + 2530502800.

It is an arithmetic number, because the mean of its divisors is an integer number (17713519467).

Almost surely, 2^101220111220 is an apocalyptic number.

101220111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101220111220 is an abundant number, since it is smaller than the sum of its proper divisors (111342122384).

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

101220111220 is a wasteful number, since it uses less digits than its factorization.

101220111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061005570 (or 5061005568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101220111220 its reverse (22111022101), we get a palindrome (123331133321).

The spelling of 101220111220 in words is "one hundred one billion, two hundred twenty million, one hundred eleven thousand, two hundred twenty".