1011223100 has 72 divisors (see below), whose sum is σ = 2287853568. Its totient is φ = 387518400.

The previous prime is 1011223097. The next prime is 1011223133. The reversal of 1011223100 is 13221101.

It is a super-2 number, since 2×1011223100² = 2045144315947220000, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 317717 + ... + 320883.

It is an arithmetic number, because the mean of its divisors is an integer number (31775744).

Almost surely, 2^1011223100 is an apocalyptic number.

1011223100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1011223100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143926784).

1011223100 is an abundant number, since it is smaller than the sum of its proper divisors (1276630468).

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

1011223100 is a wasteful number, since it uses less digits than its factorization.

1011223100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315 (or 3308 counting only the distinct ones).

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

The square root of 1011223100 is about 31799.7342756193. The cubic root of 1011223100 is about 1003.7271246170.

Adding to 1011223100 its reverse (13221101), we get a palindrome (1024444201).

The spelling of 1011223100 in words is "one billion, eleven million, two hundred twenty-three thousand, one hundred".