111020212220021 has 4 divisors (see below), whose sum is σ = 119560228544652. Its totient is φ = 102480195895392.

The previous prime is 111020212219993. The next prime is 111020212220033. The reversal of 111020212220021 is 120022212020111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64891257471121 + 46128954748900 = 8055511^2 + 6791830^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020212220021 - 2¹⁰ = 111020212218997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111020212220321) 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, 4270008162296 + ... + 4270008162321.

It is an arithmetic number, because the mean of its divisors is an integer number (29890057136163).

Almost surely, 2^{111020212220021} is an apocalyptic number.

It is an amenable number.

111020212220021 is a deficient number, since it is larger than the sum of its proper divisors (8540016324631).

111020212220021 is an equidigital number, since it uses as much as digits as its factorization.

111020212220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8540016324630.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 111020212220021 its reverse (120022212020111), we get a palindrome (231042424240132).

The spelling of 111020212220021 in words is "one hundred eleven trillion, twenty billion, two hundred twelve million, two hundred twenty thousand, twenty-one".