1021120112021 has 2 divisors, whose sum is σ = 1021120112022. Its totient is φ = 1021120112020.

The previous prime is 1021120111969. The next prime is 1021120112069. The reversal of 1021120112021 is 1202110211201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805127549521 + 215992562500 = 897289^2 + 464750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021120112021 - 2³⁸ = 746242205077 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 = 1021120111987 and 1021120112005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021120112071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510560056010 + 510560056011.

It is an arithmetic number, because the mean of its divisors is an integer number (510560056011).

Almost surely, 2^{1021120112021} is an apocalyptic number.

It is an amenable number.

1021120112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021120112021 is an equidigital number, since it uses as much as digits as its factorization.

1021120112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021120112021 its reverse (1202110211201), we get a palindrome (2223230323222).

It can be divided in two parts, 10211201 and 12021, that multiplied together give a palindrome (122748847221).

The spelling of 1021120112021 in words is "one trillion, twenty-one billion, one hundred twenty million, one hundred twelve thousand, twenty-one".