11121002021 has 4 divisors (see below), whose sum is σ = 11604523872. Its totient is φ = 10637480172.

The previous prime is 11121002017. The next prime is 11121002023. The reversal of 11121002021 is 12020012111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12020012111 = 66883 ⋅179717.

It is a cyclic number.

It is not a de Polignac number, because 11121002021 - 2² = 11121002017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121001993 and 11121002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121002023) 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, 241760891 + ... + 241760936.

It is an arithmetic number, because the mean of its divisors is an integer number (2901130968).

Almost surely, 2^11121002021 is an apocalyptic number.

It is an amenable number.

11121002021 is a deficient number, since it is larger than the sum of its proper divisors (483521851).

11121002021 is an equidigital number, since it uses as much as digits as its factorization.

11121002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483521850.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11121002021 its reverse (12020012111), we get a palindrome (23141014132).

The spelling of 11121002021 in words is "eleven billion, one hundred twenty-one million, two thousand, twenty-one".