20331203213257 has 2 divisors, whose sum is σ = 20331203213258. Its totient is φ = 20331203213256.

The previous prime is 20331203213203. The next prime is 20331203213371. The reversal of 20331203213257 is 75231230213302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20185934751376 + 145268461881 = 4492876^2 + 381141^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331203213257 - 2²³ = 20331194824649 is a prime.

It is not a weakly prime, because it can be changed into another prime (20331203213857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165601606628 + 10165601606629.

It is an arithmetic number, because the mean of its divisors is an integer number (10165601606629).

Almost surely, 2^{20331203213257} is an apocalyptic number.

It is an amenable number.

20331203213257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331203213257 is an equidigital number, since it uses as much as digits as its factorization.

20331203213257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 34.

Adding to 20331203213257 its reverse (75231230213302), we get a palindrome (95562433426559).

The spelling of 20331203213257 in words is "twenty trillion, three hundred thirty-one billion, two hundred three million, two hundred thirteen thousand, two hundred fifty-seven".