11000121021 has 12 divisors (see below), whose sum is σ = 15923093472. Its totient is φ = 7317707976.

The previous prime is 11000121019. The next prime is 11000121043. The reversal of 11000121021 is 12012100011.

It is a happy number.

It is not a de Polignac number, because 11000121021 - 2¹ = 11000121019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 11000120994 and 11000121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000121001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1304401 + ... + 1312806.

It is an arithmetic number, because the mean of its divisors is an integer number (1326924456).

Almost surely, 2^11000121021 is an apocalyptic number.

It is an amenable number.

11000121021 is a deficient number, since it is larger than the sum of its proper divisors (4922972451).

11000121021 is a wasteful number, since it uses less digits than its factorization.

11000121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617680 (or 2617677 counting only the distinct ones).

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

Adding to 11000121021 its reverse (12012100011), we get a palindrome (23012221032).

The spelling of 11000121021 in words is "eleven billion, one hundred twenty-one thousand, twenty-one".