111100210120021 has 2 divisors, whose sum is σ = 111100210120022. Its totient is φ = 111100210120020.

The previous prime is 111100210119991. The next prime is 111100210120037. The reversal of 111100210120021 is 120021012001111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61522923759025 + 49577286360996 = 7843655^2 + 7041114^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100210120021 - 2⁵ = 111100210119989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111100210119983 and 111100210120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100210124021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550105060010 + 55550105060011.

It is an arithmetic number, because the mean of its divisors is an integer number (55550105060011).

Almost surely, 2^{111100210120021} is an apocalyptic number.

It is an amenable number.

111100210120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100210120021 is an equidigital number, since it uses as much as digits as its factorization.

111100210120021 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 13.

Adding to 111100210120021 its reverse (120021012001111), we get a palindrome (231121222121132).

The spelling of 111100210120021 in words is "one hundred eleven trillion, one hundred billion, two hundred ten million, one hundred twenty thousand, twenty-one".