1100210121 has 20 divisors (see below), whose sum is σ = 1645052112. Its totient is φ = 732791448.

The previous prime is 1100210101. The next prime is 1100210123. The reversal of 1100210121 is 1210120011.

It is a happy number.

It is not a de Polignac number, because 1100210121 - 2¹⁷ = 1100079049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1100210123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 90426 + ... + 101868.

Almost surely, 2^1100210121 is an apocalyptic number.

It is an amenable number.

1100210121 is a deficient number, since it is larger than the sum of its proper divisors (544841991).

1100210121 is a wasteful number, since it uses less digits than its factorization.

1100210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12642 (or 12633 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1100210121 is about 33169.4154455577. The cubic root of 1100210121 is about 1032.3458396748.

Adding to 1100210121 its reverse (1210120011), we get a palindrome (2310330132).

The spelling of 1100210121 in words is "one billion, one hundred million, two hundred ten thousand, one hundred twenty-one".