1100401220 has 12 divisors (see below), whose sum is σ = 2310842604. Its totient is φ = 440160480.

The previous prime is 1100401219. The next prime is 1100401231. The reversal of 1100401220 is 221040011.

It can be written as a sum of positive squares in 2 ways, for example, as 300190276 + 800210944 = 17326^2 + 28288^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27510011 + ... + 27510050.

It is an arithmetic number, because the mean of its divisors is an integer number (192570217).

Almost surely, 2^1100401220 is an apocalyptic number.

1100401220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100401220 is an abundant number, since it is smaller than the sum of its proper divisors (1210441384).

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

1100401220 is a wasteful number, since it uses less digits than its factorization.

1100401220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55020070 (or 55020068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1100401220 is about 33172.2959711866. The cubic root of 1100401220 is about 1032.4056066935.

Adding to 1100401220 its reverse (221040011), we get a palindrome (1321441231).

The spelling of 1100401220 in words is "one billion, one hundred million, four hundred one thousand, two hundred twenty".