1000122220 has 24 divisors (see below), whose sum is σ = 2101629600. Its totient is φ = 399787392.

The previous prime is 1000122191. The next prime is 1000122239. The reversal of 1000122220 is 222210001.

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 = 1000122197 and 1000122206.

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, 16641 + ... + 47719.

It is an arithmetic number, because the mean of its divisors is an integer number (87567900).

Almost surely, 2^1000122220 is an apocalyptic number.

1000122220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000122220 is an abundant number, since it is smaller than the sum of its proper divisors (1101507380).

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

1000122220 is a wasteful number, since it uses less digits than its factorization.

1000122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32697 (or 32695 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1000122220 is about 31624.7090105190. The cubic root of 1000122220 is about 1000.0407383404.

Adding to 1000122220 its reverse (222210001), we get a palindrome (1222332221).

The spelling of 1000122220 in words is "one billion, one hundred twenty-two thousand, two hundred twenty".