111200210021 has 2 divisors, whose sum is σ = 111200210022. Its totient is φ = 111200210020.

The previous prime is 111200210003. The next prime is 111200210053. The reversal of 111200210021 is 120012002111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65666625025 + 45533584996 = 256255^2 + 213386^2 .

It is a cyclic number.

It is not a de Polignac number, because 111200210021 - 2¹⁰ = 111200208997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111200209984 and 111200210011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111200210221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600105010 + 55600105011.

It is an arithmetic number, because the mean of its divisors is an integer number (55600105011).

Almost surely, 2^111200210021 is an apocalyptic number.

It is an amenable number.

111200210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111200210021 is an equidigital number, since it uses as much as digits as its factorization.

111200210021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 111200210021 its reverse (120012002111), we get a palindrome (231212212132).

The spelling of 111200210021 in words is "one hundred eleven billion, two hundred million, two hundred ten thousand, twenty-one".