1101100020021 has 32 divisors (see below), whose sum is σ = 1727789253120. Its totient is φ = 690656873472.

The previous prime is 1101100020011. The next prime is 1101100020049. The reversal of 1101100020021 is 1200200011011.

It is a happy number.

It is not a de Polignac number, because 1101100020021 - 2¹⁹ = 1101099495733 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 = 1101100019985 and 1101100020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101100020001) 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 31 ways as a sum of consecutive naturals, for example, 990781 + ... + 1784333.

It is an arithmetic number, because the mean of its divisors is an integer number (53993414160).

Almost surely, 2^{1101100020021} is an apocalyptic number.

It is an amenable number.

1101100020021 is a deficient number, since it is larger than the sum of its proper divisors (626689233099).

1101100020021 is a wasteful number, since it uses less digits than its factorization.

1101100020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796602 (or 796596 counting only the distinct ones).

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

Adding to 1101100020021 its reverse (1200200011011), we get a palindrome (2301300031032).

The spelling of 1101100020021 in words is "one trillion, one hundred one billion, one hundred million, twenty thousand, twenty-one".