1100121540 has 144 divisors (see below), whose sum is σ = 3596285952. Its totient is φ = 250543104.

The previous prime is 1100121509. The next prime is 1100121559. The reversal of 1100121540 is 451210011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1125532 + ... + 1126508.

It is an arithmetic number, because the mean of its divisors is an integer number (24974208).

Almost surely, 2^1100121540 is an apocalyptic number.

1100121540 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 1100121540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798142976).

1100121540 is an abundant number, since it is smaller than the sum of its proper divisors (2496164412).

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

1100121540 is a wasteful number, since it uses less digits than its factorization.

1100121540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1377 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1100121540 is about 33168.0801373851. The cubic root of 1100121540 is about 1032.3181332457.

Adding to 1100121540 its reverse (451210011), we get a palindrome (1551331551).

The spelling of 1100121540 in words is "one billion, one hundred million, one hundred twenty-one thousand, five hundred forty".