1021110212021 has 2 divisors, whose sum is σ = 1021110212022. Its totient is φ = 1021110212020.

The previous prime is 1021110212009. The next prime is 1021110212039. The reversal of 1021110212021 is 1202120111201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011806644996 + 9303567025 = 1005886^2 + 96455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021110212021 - 2³⁰ = 1020036470197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021110211987 and 1021110212005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021110512021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510555106010 + 510555106011.

It is an arithmetic number, because the mean of its divisors is an integer number (510555106011).

Almost surely, 2^{1021110212021} is an apocalyptic number.

It is an amenable number.

1021110212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021110212021 is an equidigital number, since it uses as much as digits as its factorization.

1021110212021 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 1021110212021 its reverse (1202120111201), we get a palindrome (2223230323222).

The spelling of 1021110212021 in words is "one trillion, twenty-one billion, one hundred ten million, two hundred twelve thousand, twenty-one".