11010020121 has 32 divisors (see below), whose sum is σ = 17033195520. Its totient is φ = 7015572432.

The previous prime is 11010020111. The next prime is 11010020123. The reversal of 11010020121 is 12102001011.

It is a happy number.

It is not a de Polignac number, because 11010020121 - 2⁹ = 11010019609 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 (11010020123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 917466 + ... + 929388.

It is an arithmetic number, because the mean of its divisors is an integer number (532287360).

Almost surely, 2^11010020121 is an apocalyptic number.

It is an amenable number.

11010020121 is a deficient number, since it is larger than the sum of its proper divisors (6023175399).

11010020121 is a wasteful number, since it uses less digits than its factorization.

11010020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13442 (or 13436 counting only the distinct ones).

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

Adding to 11010020121 its reverse (12102001011), we get a palindrome (23112021132).

The spelling of 11010020121 in words is "eleven billion, ten million, twenty thousand, one hundred twenty-one".