1111020120021 has 96 divisors (see below), whose sum is σ = 1807158712320. Its totient is φ = 594614245248.

The previous prime is 1111020119977. The next prime is 1111020120031. The reversal of 1111020120021 is 1200210201111.

It is not a de Polignac number, because 1111020120021 - 2¹⁰ = 1111020118997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111020119979 and 1111020120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111020120031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 865954246 + ... + 865955528.

It is an arithmetic number, because the mean of its divisors is an integer number (18824569920).

Almost surely, 2^{1111020120021} is an apocalyptic number.

It is an amenable number.

1111020120021 is a deficient number, since it is larger than the sum of its proper divisors (696138592299).

1111020120021 is a wasteful number, since it uses less digits than its factorization.

1111020120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1111020120021 its reverse (1200210201111), we get a palindrome (2311230321132).

The spelling of 1111020120021 in words is "one trillion, one hundred eleven billion, twenty million, one hundred twenty thousand, twenty-one".