11220001001 has 24 divisors (see below), whose sum is σ = 12750045000. Its totient is φ = 9859449600.

The previous prime is 11220000937. The next prime is 11220001007. The reversal of 11220001001 is 10010002211.

It can be written as a sum of positive squares in 4 ways, for example, as 105781225 + 11114219776 = 10285^2 + 105424^2 .

It is not a de Polignac number, because 11220001001 - 2⁶ = 11220000937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11220001001.

It is not an unprimeable number, because it can be changed into a prime (11220001007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 530375 + ... + 551123.

It is an arithmetic number, because the mean of its divisors is an integer number (531251875).

Almost surely, 2^11220001001 is an apocalyptic number.

11220001001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11220001001 is a deficient number, since it is larger than the sum of its proper divisors (1530043999).

11220001001 is a wasteful number, since it uses less digits than its factorization.

11220001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20921 (or 20910 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 11220001001 its reverse (10010002211), we get a palindrome (21230003212).

The spelling of 11220001001 in words is "eleven billion, two hundred twenty million, one thousand, one".