21200322257 has 2 divisors, whose sum is σ = 21200322258. Its totient is φ = 21200322256.

The previous prime is 21200322239. The next prime is 21200322337. The reversal of 21200322257 is 75222300212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12317448256 + 8882874001 = 110984^2 + 94249^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200322257 - 2⁸ = 21200322001 is a prime.

It is not a weakly prime, because it can be changed into another prime (21200322557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600161128 + 10600161129.

It is an arithmetic number, because the mean of its divisors is an integer number (10600161129).

Almost surely, 2^21200322257 is an apocalyptic number.

It is an amenable number.

21200322257 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200322257 is an equidigital number, since it uses as much as digits as its factorization.

21200322257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

Adding to 21200322257 its reverse (75222300212), we get a palindrome (96422622469).

The spelling of 21200322257 in words is "twenty-one billion, two hundred million, three hundred twenty-two thousand, two hundred fifty-seven".