101001111220 has 24 divisors (see below), whose sum is σ = 212110532424. Its totient is φ = 40398882816.

The previous prime is 101001111187. The next prime is 101001111247. The reversal of 101001111220 is 22111100101.

It can be written as a sum of positive squares in 4 ways, for example, as 1975091364 + 99026019856 = 44442^2 + 314684^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 101001111197 and 101001111206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531684 + ... + 696196.

It is an arithmetic number, because the mean of its divisors is an integer number (8837938851).

Almost surely, 2^101001111220 is an apocalyptic number.

101001111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101001111220 is an abundant number, since it is smaller than the sum of its proper divisors (111109421204).

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

101001111220 is a wasteful number, since it uses less digits than its factorization.

101001111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195219 (or 195217 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 101001111220 its reverse (22111100101), we get a palindrome (123112211321).

The spelling of 101001111220 in words is "one hundred one billion, one million, one hundred eleven thousand, two hundred twenty".