1100121564 has 24 divisors (see below), whose sum is σ = 2573560080. Its totient is φ = 365762944.

The previous prime is 1100121559. The next prime is 1100121587. The reversal of 1100121564 is 4651210011.

It is a self number, because there is not a number n which added to its sum of digits gives 1100121564.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113169 + ... + 122504.

It is an arithmetic number, because the mean of its divisors is an integer number (107231670).

Almost surely, 2^1100121564 is an apocalyptic number.

It is an amenable number.

1100121564 is an abundant number, since it is smaller than the sum of its proper divisors (1473438516).

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

1100121564 is a wasteful number, since it uses less digits than its factorization.

1100121564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236069 (or 236067 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1100121564 is about 33168.0804991787. The cubic root of 1100121564 is about 1032.3181407526.

Adding to 1100121564 its reverse (4651210011), we get a palindrome (5751331575).

The spelling of 1100121564 in words is "one billion, one hundred million, one hundred twenty-one thousand, five hundred sixty-four".