1000220100 has 72 divisors (see below), whose sum is σ = 3157068768. Its totient is φ = 242476800.

The previous prime is 1000220093. The next prime is 1000220107. The reversal of 1000220100 is 10220001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1000220093) and next prime (1000220107).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (1000220107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148249 + ... + 154848.

Almost surely, 2^1000220100 is an apocalyptic number.

1000220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000220100 is an abundant number, since it is smaller than the sum of its proper divisors (2156848668).

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

1000220100 is a wasteful number, since it uses less digits than its factorization.

1000220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303125 (or 303118 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1000220100 is about 31626.2564967781. The cubic root of 1000220100 is about 1000.0733612847.

Adding to 1000220100 its reverse (10220001), we get a palindrome (1010440101).

Subtracting from 1000220100 its reverse (10220001), we obtain a palindrome (990000099).

The spelling of 1000220100 in words is "one billion, two hundred twenty thousand, one hundred".