10001111220 has 72 divisors (see below), whose sum is σ = 32121225864. Its totient is φ = 2510082048.

The previous prime is 10001111209. The next prime is 10001111231. The reversal of 10001111220 is 2211110001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10001111209) and next prime (10001111231).

It can be written as a sum of positive squares in 4 ways, for example, as 127509264 + 9873601956 = 11292^2 + 99366^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1631109 + ... + 1637228.

It is an arithmetic number, because the mean of its divisors is an integer number (446128137).

Almost surely, 2^10001111220 is an apocalyptic number.

10001111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10001111220 is an abundant number, since it is smaller than the sum of its proper divisors (22120114644).

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

10001111220 is a wasteful number, since it uses less digits than its factorization.

10001111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268369 (or 3268364 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10001111220 its reverse (2211110001), we get a palindrome (12212221221).

The spelling of 10001111220 in words is "ten billion, one million, one hundred eleven thousand, two hundred twenty".