11121011120021 has 4 divisors (see below), whose sum is σ = 12132012130944. Its totient is φ = 10110010109100.

The previous prime is 11121011119987. The next prime is 11121011120057. The reversal of 11121011120021 is 12002111012111.

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.

It is not a de Polignac number, because 11121011120021 - 2⁶ = 11121011119957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121011119978 and 11121011120005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121011120221) 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, 505500505445 + ... + 505500505466.

It is an arithmetic number, because the mean of its divisors is an integer number (3033003032736).

Almost surely, 2^{11121011120021} is an apocalyptic number.

11121011120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121011120021 is a deficient number, since it is larger than the sum of its proper divisors (1011001010923).

11121011120021 is a wasteful number, since it uses less digits than its factorization.

11121011120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011001010922.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11121011120021 its reverse (12002111012111), we get a palindrome (23123122132132).

The spelling of 11121011120021 in words is "eleven trillion, one hundred twenty-one billion, eleven million, one hundred twenty thousand, twenty-one".