21322229 has 2 divisors, whose sum is σ = 21322230. Its totient is φ = 21322228.

The previous prime is 21322207. The next prime is 21322241. The reversal of 21322229 is 92222312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21141604 + 180625 = 4598^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322229 - 2¹⁶ = 21256693 is a prime.

It is a Chen prime.

It is equal to p_1349051 and since 21322229 and 1349051 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661114 + 10661115.

It is an arithmetic number, because the mean of its divisors is an integer number (10661115).

Almost surely, 2^21322229 is an apocalyptic number.

It is an amenable number.

21322229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322229 is an equidigital number, since it uses as much as digits as its factorization.

21322229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 21322229 is about 4617.5999177062. The cubic root of 21322229 is about 277.2963806717.

It can be divided in two parts, 2 and 1322229, that added together give a palindrome (1322231).

The spelling of 21322229 in words is "twenty-one million, three hundred twenty-two thousand, two hundred twenty-nine".