111210000220021 has 2 divisors, whose sum is σ = 111210000220022. Its totient is φ = 111210000220020.

The previous prime is 111210000220019. The next prime is 111210000220027. The reversal of 111210000220021 is 120022000012111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93466646874225 + 17743353345796 = 9667815^2 + 4212286^2 .

It is a cyclic number.

It is not a de Polignac number, because 111210000220021 - 2¹ = 111210000220019 is a prime.

Together with 111210000220019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 111210000219983 and 111210000220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111210000220027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605000110010 + 55605000110011.

It is an arithmetic number, because the mean of its divisors is an integer number (55605000110011).

Almost surely, 2^{111210000220021} is an apocalyptic number.

It is an amenable number.

111210000220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111210000220021 is an equidigital number, since it uses as much as digits as its factorization.

111210000220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111210000220021 its reverse (120022000012111), we get a palindrome (231232000232132).

The spelling of 111210000220021 in words is "one hundred eleven trillion, two hundred ten billion, two hundred twenty thousand, twenty-one".