21325555337 has 2 divisors, whose sum is σ = 21325555338. Its totient is φ = 21325555336.

The previous prime is 21325555319. The next prime is 21325555343. The reversal of 21325555337 is 73355552312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14598438976 + 6727116361 = 120824^2 + 82019^2 .

It is a cyclic number.

It is not a de Polignac number, because 21325555337 - 2²⁴ = 21308778121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21325555294 and 21325555303.

It is not a weakly prime, because it can be changed into another prime (21325555367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10662777668 + 10662777669.

It is an arithmetic number, because the mean of its divisors is an integer number (10662777669).

Almost surely, 2^21325555337 is an apocalyptic number.

It is an amenable number.

21325555337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325555337 is an equidigital number, since it uses as much as digits as its factorization.

21325555337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472500, while the sum is 41.

The spelling of 21325555337 in words is "twenty-one billion, three hundred twenty-five million, five hundred fifty-five thousand, three hundred thirty-seven".