20101304251 has 6 divisors (see below), whose sum is σ = 23383149900. Its totient is φ = 17229689316.

The previous prime is 20101304243. The next prime is 20101304257. The reversal of 20101304251 is 15240310102.

It is not a de Polignac number, because 20101304251 - 2³ = 20101304243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101304257) 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 5 ways as a sum of consecutive naturals, for example, 205115301 + ... + 205115398.

It is an arithmetic number, because the mean of its divisors is an integer number (3897191650).

Almost surely, 2^20101304251 is an apocalyptic number.

20101304251 is a deficient number, since it is larger than the sum of its proper divisors (3281845649).

20101304251 is an equidigital number, since it uses as much as digits as its factorization.

20101304251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410230713 (or 410230706 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 20101304251 its reverse (15240310102), we get a palindrome (35341614353).

The spelling of 20101304251 in words is "twenty billion, one hundred one million, three hundred four thousand, two hundred fifty-one".