1322120021 has 2 divisors, whose sum is σ = 1322120022. Its totient is φ = 1322120020.

The previous prime is 1322120003. The next prime is 1322120027. The reversal of 1322120021 is 1200212231.

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., 1104232900 + 217887121 = 33230^2 + 14761^2 .

It is an emirp because it is prime and its reverse (1200212231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1322120021 - 2¹⁴ = 1322103637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1322119978 and 1322120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1322120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661060010 + 661060011.

It is an arithmetic number, because the mean of its divisors is an integer number (661060011).

Almost surely, 2^1322120021 is an apocalyptic number.

It is an amenable number.

1322120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1322120021 is an equidigital number, since it uses as much as digits as its factorization.

1322120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1322120021 is about 36360.9683726933. The cubic root of 1322120021 is about 1097.5482643006.

Adding to 1322120021 its reverse (1200212231), we get a palindrome (2522332252).

The spelling of 1322120021 in words is "one billion, three hundred twenty-two million, one hundred twenty thousand, twenty-one".