1101020121 has 24 divisors (see below), whose sum is σ = 1652370720. Its totient is φ = 732631392.

The previous prime is 1101020111. The next prime is 1101020159. The reversal of 1101020121 is 1210201011.

It is a happy number.

It is not a de Polignac number, because 1101020121 - 2⁶ = 1101020057 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 (1101020111) 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, 134286 + ... + 142248.

It is an arithmetic number, because the mean of its divisors is an integer number (68848780).

Almost surely, 2^1101020121 is an apocalyptic number.

It is an amenable number.

1101020121 is a deficient number, since it is larger than the sum of its proper divisors (551350599).

1101020121 is an frugal number, since it uses more digits than its factorization.

1101020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8547 (or 8535 counting only the distinct ones).

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

The square root of 1101020121 is about 33181.6232423913. The cubic root of 1101020121 is about 1032.5991231122.

Adding to 1101020121 its reverse (1210201011), we get a palindrome (2311221132).

The spelling of 1101020121 in words is "one billion, one hundred one million, twenty thousand, one hundred twenty-one".