1122020021 has 2 divisors, whose sum is σ = 1122020022. Its totient is φ = 1122020020.

The previous prime is 1122019973. The next prime is 1122020023. The reversal of 1122020021 is 1200202211.

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., 1111222225 + 10797796 = 33335^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1122020021 - 2²⁶ = 1054911157 is a prime.

Together with 1122020023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1122019984 and 1122020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122020023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561010010 + 561010011.

It is an arithmetic number, because the mean of its divisors is an integer number (561010011).

Almost surely, 2^1122020021 is an apocalyptic number.

It is an amenable number.

1122020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122020021 is an equidigital number, since it uses as much as digits as its factorization.

1122020021 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 11.

The square root of 1122020021 is about 33496.5673017400. The cubic root of 1122020021 is about 1039.1227874844.

Adding to 1122020021 its reverse (1200202211), we get a palindrome (2322222232).

The spelling of 1122020021 in words is "one billion, one hundred twenty-two million, twenty thousand, twenty-one".