1020111120021 has 16 divisors (see below), whose sum is σ = 1554625200128. Its totient is φ = 582856830000.

The previous prime is 1020111120001. The next prime is 1020111120079. The reversal of 1020111120021 is 1200211110201.

It is not a de Polignac number, because 1020111120021 - 2⁶ = 1020111119957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020111119979 and 1020111120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020111120001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2462005 + ... + 2846346.

It is an arithmetic number, because the mean of its divisors is an integer number (97164075008).

Almost surely, 2^{1020111120021} is an apocalyptic number.

It is an amenable number.

1020111120021 is a deficient number, since it is larger than the sum of its proper divisors (534514080107).

1020111120021 is an equidigital number, since it uses as much as digits as its factorization.

1020111120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317512.

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

Adding to 1020111120021 its reverse (1200211110201), we get a palindrome (2220322230222).

The spelling of 1020111120021 in words is "one trillion, twenty billion, one hundred eleven million, one hundred twenty thousand, twenty-one".