11001210021 has 8 divisors (see below), whose sum is σ = 16298088960. Its totient is φ = 7334139996.

The previous prime is 11001210019. The next prime is 11001210047. The reversal of 11001210021 is 12001210011.

It is a happy number.

11001210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11001210021 - 2¹ = 11001210019 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 = 11001209985 and 11001210012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001210071) 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 7 ways as a sum of consecutive naturals, for example, 203726085 + ... + 203726138.

It is an arithmetic number, because the mean of its divisors is an integer number (2037261120).

Almost surely, 2^11001210021 is an apocalyptic number.

It is an amenable number.

11001210021 is a deficient number, since it is larger than the sum of its proper divisors (5296878939).

11001210021 is an equidigital number, since it uses as much as digits as its factorization.

11001210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407452232 (or 407452226 counting only the distinct ones).

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

Adding to 11001210021 its reverse (12001210011), we get a palindrome (23002420032).

It can be divided in two parts, 1100 and 1210021, that added together give a palindrome (1211121).

The spelling of 11001210021 in words is "eleven billion, one million, two hundred ten thousand, twenty-one".