21322207 has 2 divisors, whose sum is σ = 21322208. Its totient is φ = 21322206.

The previous prime is 21322201. The next prime is 21322229. The reversal of 21322207 is 70222312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21322207 - 2¹⁵ = 21289439 is a prime.

It is a super-2 number, since 2×21322207² = 909273022701698, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661103 + 10661104.

It is an arithmetic number, because the mean of its divisors is an integer number (10661104).

Almost surely, 2^21322207 is an apocalyptic number.

21322207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322207 is an equidigital number, since it uses as much as digits as its factorization.

21322207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 21322207 is about 4617.5975355156. The cubic root of 21322207 is about 277.2962853014.

Adding to 21322207 its reverse (70222312), we get a palindrome (91544519).

The spelling of 21322207 in words is "twenty-one million, three hundred twenty-two thousand, two hundred seven".