20110011021 has 14 divisors (see below), whose sum is σ = 30151224750. Its totient is φ = 13406673528.

The previous prime is 20110011017. The next prime is 20110011041. The reversal of 20110011021 is 12011001102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12147125796 + 7962885225 = 110214^2 + 89235^2 .

It is not a de Polignac number, because 20110011021 - 2² = 20110011017 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 = 20110010994 and 20110011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110011001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13792146 + ... + 13793603.

Almost surely, 2^20110011021 is an apocalyptic number.

It is an amenable number.

20110011021 is a deficient number, since it is larger than the sum of its proper divisors (10041213729).

20110011021 is an frugal number, since it uses more digits than its factorization.

20110011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27585767 (or 27585752 counting only the distinct ones).

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

Adding to 20110011021 its reverse (12011001102), we get a palindrome (32121012123).

The spelling of 20110011021 in words is "twenty billion, one hundred ten million, eleven thousand, twenty-one".