51093593221 has 12 divisors (see below), whose sum is σ = 56340195436. Its totient is φ = 46300288320.

The previous prime is 51093593207. The next prime is 51093593227. The reversal of 51093593221 is 12239539015.

It can be written as a sum of positive squares in 2 ways, for example, as 26093556225 + 25000036996 = 161535^2 + 158114^2 .

It is not a de Polignac number, because 51093593221 - 2⁹ = 51093592709 is a prime.

It is a super-2 number, since 2×51093593221² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51093593227) 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 11 ways as a sum of consecutive naturals, for example, 636666 + ... + 712411.

Almost surely, 2^51093593221 is an apocalyptic number.

It is an amenable number.

51093593221 is a deficient number, since it is larger than the sum of its proper divisors (5246602215).

51093593221 is a wasteful number, since it uses less digits than its factorization.

51093593221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349412 (or 1349401 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 40.

The spelling of 51093593221 in words is "fifty-one billion, ninety-three million, five hundred ninety-three thousand, two hundred twenty-one".