1111021210021 has 2 divisors, whose sum is σ = 1111021210022. Its totient is φ = 1111021210020.

The previous prime is 1111021210007. The next prime is 1111021210031. The reversal of 1111021210021 is 1200121201111.

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., 760366560100 + 350654649921 = 871990^2 + 592161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111021210021 - 2³⁵ = 1076661471653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111021209983 and 1111021210010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111021210031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555510605010 + 555510605011.

It is an arithmetic number, because the mean of its divisors is an integer number (555510605011).

Almost surely, 2^{1111021210021} is an apocalyptic number.

It is an amenable number.

1111021210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111021210021 is an equidigital number, since it uses as much as digits as its factorization.

1111021210021 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 1111021210021 its reverse (1200121201111), we get a palindrome (2311142411132).

The spelling of 1111021210021 in words is "one trillion, one hundred eleven billion, twenty-one million, two hundred ten thousand, twenty-one".