1101111212021 has 2 divisors, whose sum is σ = 1101111212022. Its totient is φ = 1101111212020.

The previous prime is 1101111211999. The next prime is 1101111212077. The reversal of 1101111212021 is 1202121111011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008718922500 + 92392289521 = 1004350^2 + 303961^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101111212021 - 2²⁶ = 1101044103157 is a prime.

It is a super-2 number, since 2×1101111212021² (a number of 25 digits) contains 22 as substring.

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 = 1101111211987 and 1101111212005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101111212521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550555606010 + 550555606011.

It is an arithmetic number, because the mean of its divisors is an integer number (550555606011).

Almost surely, 2^{1101111212021} is an apocalyptic number.

It is an amenable number.

1101111212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101111212021 is an equidigital number, since it uses as much as digits as its factorization.

1101111212021 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 14.

Adding to 1101111212021 its reverse (1202121111011), we get a palindrome (2303232323032).

The spelling of 1101111212021 in words is "one trillion, one hundred one billion, one hundred eleven million, two hundred twelve thousand, twenty-one".