51903344021 has 2 divisors, whose sum is σ = 51903344022. Its totient is φ = 51903344020.

The previous prime is 51903343991. The next prime is 51903344027. The reversal of 51903344021 is 12044330915.

51903344021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51704392996 + 198951025 = 227386^2 + 14105^2 .

It is a cyclic number.

It is not a de Polignac number, because 51903344021 - 2²² = 51899149717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51903344027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25951672010 + 25951672011.

It is an arithmetic number, because the mean of its divisors is an integer number (25951672011).

Almost surely, 2^51903344021 is an apocalyptic number.

It is an amenable number.

51903344021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51903344021 is an equidigital number, since it uses as much as digits as its factorization.

51903344021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

Adding to 51903344021 its reverse (12044330915), we get a palindrome (63947674936).

The spelling of 51903344021 in words is "fifty-one billion, nine hundred three million, three hundred forty-four thousand, twenty-one".