11012001220 has 96 divisors (see below), whose sum is σ = 26156390400. Its totient is φ = 3857548800.

The previous prime is 11012001197. The next prime is 11012001283. The reversal of 11012001220 is 2210021011.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 11012001197 and 11012001206.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3245725 + ... + 3249115.

It is an arithmetic number, because the mean of its divisors is an integer number (272462400).

Almost surely, 2^11012001220 is an apocalyptic number.

11012001220 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 11012001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13078195200).

11012001220 is an abundant number, since it is smaller than the sum of its proper divisors (15144389180).

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

11012001220 is a wasteful number, since it uses less digits than its factorization.

11012001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3949 (or 3947 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11012001220 its reverse (2210021011), we get a palindrome (13222022231).

The spelling of 11012001220 in words is "eleven billion, twelve million, one thousand, two hundred twenty".