1011221500 has 48 divisors (see below), whose sum is σ = 2212269696. Its totient is φ = 403800000.

The previous prime is 1011221483. The next prime is 1011221513. The reversal of 1011221500 is 51221101.

1011221500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374154 + ... + 376846.

It is an arithmetic number, because the mean of its divisors is an integer number (46088952).

Almost surely, 2^1011221500 is an apocalyptic number.

1011221500 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 1011221500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106134848).

1011221500 is an abundant number, since it is smaller than the sum of its proper divisors (1201048196).

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

1011221500 is a wasteful number, since it uses less digits than its factorization.

1011221500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3463 (or 3451 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1011221500 is about 31799.7091181665. The cubic root of 1011221500 is about 1003.7265952369.

Adding to 1011221500 its reverse (51221101), we get a palindrome (1062442601).

The spelling of 1011221500 in words is "one billion, eleven million, two hundred twenty-one thousand, five hundred".