20315321251 has 16 divisors (see below), whose sum is σ = 21937766400. Its totient is φ = 18754975008.

The previous prime is 20315321239. The next prime is 20315321291. The reversal of 20315321251 is 15212351302.

It is not a de Polignac number, because 20315321251 - 2¹¹ = 20315319203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20315321291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2882590 + ... + 2889628.

It is an arithmetic number, because the mean of its divisors is an integer number (1371110400).

Almost surely, 2^20315321251 is an apocalyptic number.

20315321251 is a deficient number, since it is larger than the sum of its proper divisors (1622445149).

20315321251 is a wasteful number, since it uses less digits than its factorization.

20315321251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11418.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20315321251 its reverse (15212351302), we get a palindrome (35527672553).

The spelling of 20315321251 in words is "twenty billion, three hundred fifteen million, three hundred twenty-one thousand, two hundred fifty-one".