1099011220 has 24 divisors (see below), whose sum is σ = 2323214208. Its totient is φ = 436692000.

The previous prime is 1099011211. The next prime is 1099011247. The reversal of 1099011220 is 221109901.

1099011220 is digitally balanced in base 6, 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 7 ways as a sum of consecutive naturals, for example, 178936 + ... + 184975.

It is an arithmetic number, because the mean of its divisors is an integer number (96800592).

Almost surely, 2^1099011220 is an apocalyptic number.

1099011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099011220 is an abundant number, since it is smaller than the sum of its proper divisors (1224202988).

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

1099011220 is a wasteful number, since it uses less digits than its factorization.

1099011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364071 (or 364069 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 1099011220 is about 33151.3381328718. The cubic root of 1099011220 is about 1031.9707203299.

The spelling of 1099011220 in words is "one billion, ninety-nine million, eleven thousand, two hundred twenty".