101311220 has 12 divisors (see below), whose sum is σ = 212753604. Its totient is φ = 40524480.

The previous prime is 101311219. The next prime is 101311237. The reversal of 101311220 is 22113101.

It can be written as a sum of positive squares in 2 ways, for example, as 72624484 + 28686736 = 8522^2 + 5356^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2532761 + ... + 2532800.

It is an arithmetic number, because the mean of its divisors is an integer number (17729467).

Almost surely, 2^101311220 is an apocalyptic number.

101311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101311220 is an abundant number, since it is smaller than the sum of its proper divisors (111442384).

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

101311220 is a wasteful number, since it uses less digits than its factorization.

101311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065570 (or 5065568 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 101311220 is about 10065.3474853082. The cubic root of 101311220 is about 466.1787951265.

Adding to 101311220 its reverse (22113101), we get a palindrome (123424321).

The spelling of 101311220 in words is "one hundred one million, three hundred eleven thousand, two hundred twenty".