11121021001021 has 4 divisors (see below), whose sum is σ = 11121048574812. Its totient is φ = 11120993427232.

The previous prime is 11121021000967. The next prime is 11121021001087. The reversal of 11121021001021 is 12010012012111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4867715564100 + 6253305436921 = 2206290^2 + 2500661^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121021001021 - 2²⁵ = 11120987446589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121021000992 and 11121021001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121021001421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13172800 + ... + 13991593.

It is an arithmetic number, because the mean of its divisors is an integer number (2780262143703).

Almost surely, 2^{11121021001021} is an apocalyptic number.

It is an amenable number.

11121021001021 is a deficient number, since it is larger than the sum of its proper divisors (27573791).

11121021001021 is an equidigital number, since it uses as much as digits as its factorization.

11121021001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27573790.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11121021001021 its reverse (12010012012111), we get a palindrome (23131033013132).

The spelling of 11121021001021 in words is "eleven trillion, one hundred twenty-one billion, twenty-one million, one thousand, twenty-one".