11102001021 has 12 divisors (see below), whose sum is σ = 16630158272. Its totient is φ = 7401333852.

The previous prime is 11102001019. The next prime is 11102001023. The reversal of 11102001021 is 12010020111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11102001019) and next prime (11102001023).

It is not a de Polignac number, because 11102001021 - 2¹ = 11102001019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11102000994 and 11102001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11102001023) 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, 22843381 + ... + 22843866.

Almost surely, 2^11102001021 is an apocalyptic number.

It is an amenable number.

11102001021 is a deficient number, since it is larger than the sum of its proper divisors (5528157251).

11102001021 is an frugal number, since it uses more digits than its factorization.

11102001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45687262 (or 45687250 counting only the distinct ones).

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

Adding to 11102001021 its reverse (12010020111), we get a palindrome (23112021132).

The spelling of 11102001021 in words is "eleven billion, one hundred two million, one thousand, twenty-one".