1101112100021 has 2 divisors, whose sum is σ = 1101112100022. Its totient is φ = 1101112100020.

The previous prime is 1101112099993. The next prime is 1101112100027. The reversal of 1101112100021 is 1200012111011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554235580900 + 546876519121 = 744470^2 + 739511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1101112100021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101112099975 and 1101112100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101112100027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550556050010 + 550556050011.

It is an arithmetic number, because the mean of its divisors is an integer number (550556050011).

Almost surely, 2^{1101112100021} is an apocalyptic number.

It is an amenable number.

1101112100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101112100021 is an equidigital number, since it uses as much as digits as its factorization.

1101112100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1101112100021 its reverse (1200012111011), we get a palindrome (2301124211032).

The spelling of 1101112100021 in words is "one trillion, one hundred one billion, one hundred twelve million, one hundred thousand, twenty-one".