1021120112221 has 16 divisors (see below), whose sum is σ = 1125102053376. Its totient is φ = 918999000000.

The previous prime is 1021120112189. The next prime is 1021120112263. The reversal of 1021120112221 is 1222110211201.

It is not a de Polignac number, because 1021120112221 - 2⁵ = 1021120112189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021120112195 and 1021120112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021120112281) 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 15 ways as a sum of consecutive naturals, for example, 11187871 + ... + 11278771.

It is an arithmetic number, because the mean of its divisors is an integer number (70318878336).

Almost surely, 2^{1021120112221} is an apocalyptic number.

1021120112221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021120112221 is a deficient number, since it is larger than the sum of its proper divisors (103981941155).

1021120112221 is a wasteful number, since it uses less digits than its factorization.

1021120112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101124.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1021120112221 its reverse (1222110211201), we get a palindrome (2243230323422).

The spelling of 1021120112221 in words is "one trillion, twenty-one billion, one hundred twenty million, one hundred twelve thousand, two hundred twenty-one".