1011111120021 has 32 divisors (see below), whose sum is σ = 1369702309248. Its totient is φ = 663363993600.

The previous prime is 1011111120013. The next prime is 1011111120067. The reversal of 1011111120021 is 1200211111101.

It is not a de Polignac number, because 1011111120021 - 2³ = 1011111120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011111119979 and 1011111120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111124021) 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 31 ways as a sum of consecutive naturals, for example, 102117171 + ... + 102127071.

It is an arithmetic number, because the mean of its divisors is an integer number (42803197164).

Almost surely, 2^{1011111120021} is an apocalyptic number.

It is an amenable number.

1011111120021 is a deficient number, since it is larger than the sum of its proper divisors (358591189227).

1011111120021 is a wasteful number, since it uses less digits than its factorization.

1011111120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11541.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1011111120021 its reverse (1200211111101), we get a palindrome (2211322231122).

The spelling of 1011111120021 in words is "one trillion, eleven billion, one hundred eleven million, one hundred twenty thousand, twenty-one".