1001220100 has 36 divisors (see below), whose sum is σ = 2300454324. Its totient is φ = 376929280.

The previous prime is 1001220097. The next prime is 1001220131. The reversal of 1001220100 is 10221001.

It can be written as a sum of positive squares in 6 ways, for example, as 36869184 + 964350916 = 6072^2 + 31054^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292777 + ... + 296176.

It is an arithmetic number, because the mean of its divisors is an integer number (63901509).

Almost surely, 2^1001220100 is an apocalyptic number.

1001220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001220100 is an abundant number, since it is smaller than the sum of its proper divisors (1299234224).

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

1001220100 is a wasteful number, since it uses less digits than its factorization.

1001220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588984 (or 588977 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1001220100 is about 31642.0621957546. The cubic root of 1001220100 is about 1000.4065347071.

Adding to 1001220100 its reverse (10221001), we get a palindrome (1011441101).

Subtracting from 1001220100 its reverse (10221001), we obtain a palindrome (990999099).

The spelling of 1001220100 in words is "one billion, one million, two hundred twenty thousand, one hundred".