111021221121021 has 6 divisors (see below), whose sum is σ = 160363986063710. Its totient is φ = 74014147414008.

The previous prime is 111021221120941. The next prime is 111021221121023. The reversal of 111021221121021 is 120121122120111.

It is a happy number.

111021221121021 is a `hidden beast` number, since 1 + 1 + 10 + 212 + 211 + 210 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 102630292296921 + 8390928824100 = 10130661^2 + 2896710^2 .

It is not a de Polignac number, because 111021221121021 - 2¹³ = 111021221112829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021221120985 and 111021221121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021221121023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6167845617826 + ... + 6167845617843.

Almost surely, 2^{111021221121021} is an apocalyptic number.

It is an amenable number.

111021221121021 is a deficient number, since it is larger than the sum of its proper divisors (49342764942689).

111021221121021 is a wasteful number, since it uses less digits than its factorization.

111021221121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12335691235675 (or 12335691235672 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111021221121021 its reverse (120121122120111), we get a palindrome (231142343241132).

The spelling of 111021221121021 in words is "one hundred eleven trillion, twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty-one".