251021132505103 has 2 divisors, whose sum is σ = 251021132505104. Its totient is φ = 251021132505102.

The previous prime is 251021132505083. The next prime is 251021132505173. The reversal of 251021132505103 is 301505231120152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251021132505103 - 2⁹ = 251021132504591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251021132505173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125510566252551 + 125510566252552.

It is an arithmetic number, because the mean of its divisors is an integer number (125510566252552).

Almost surely, 2^{251021132505103} is an apocalyptic number.

251021132505103 is a deficient number, since it is larger than the sum of its proper divisors (1).

251021132505103 is an equidigital number, since it uses as much as digits as its factorization.

251021132505103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 251021132505103 its reverse (301505231120152), we get a palindrome (552526363625255).

The spelling of 251021132505103 in words is "two hundred fifty-one trillion, twenty-one billion, one hundred thirty-two million, five hundred five thousand, one hundred three".