11100020121 has 6 divisors (see below), whose sum is σ = 16033362410. Its totient is φ = 7400013408.

The previous prime is 11100020119. The next prime is 11100020143. The reversal of 11100020121 is 12102000111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11095672896 + 4347225 = 105336^2 + 2085^2 .

It is not a de Polignac number, because 11100020121 - 2¹ = 11100020119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 1233335569 = 11100020121 / (1 + 1 + 1 + 0 + 0 + 0 + 2 + 0 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11100020821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 616667776 + ... + 616667793.

Almost surely, 2^11100020121 is an apocalyptic number.

It is an amenable number.

11100020121 is a deficient number, since it is larger than the sum of its proper divisors (4933342289).

11100020121 is a wasteful number, since it uses less digits than its factorization.

11100020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233335575 (or 1233335572 counting only the distinct ones).

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

Adding to 11100020121 its reverse (12102000111), we get a palindrome (23202020232).

The spelling of 11100020121 in words is "eleven billion, one hundred million, twenty thousand, one hundred twenty-one".