22321021 has 2 divisors, whose sum is σ = 22321022. Its totient is φ = 22321020.

The previous prime is 22321009. The next prime is 22321043. The reversal of 22321021 is 12012322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22221796 + 99225 = 4714^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 22321021 - 2¹⁷ = 22189949 is a prime.

It is a super-3 number, since 3×22321021³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22320992 and 22321010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22321421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11160510 + 11160511.

It is an arithmetic number, because the mean of its divisors is an integer number (11160511).

Almost surely, 2^22321021 is an apocalyptic number.

It is an amenable number.

22321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22321021 is an equidigital number, since it uses as much as digits as its factorization.

22321021 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 13.

The square root of 22321021 is about 4724.5127791128. The cubic root of 22321021 is about 281.5602564017.

Adding to 22321021 its reverse (12012322), we get a palindrome (34333343).

The spelling of 22321021 in words is "twenty-two million, three hundred twenty-one thousand, twenty-one".