51221343254 has 8 divisors (see below), whose sum is σ = 77150820648. Its totient is φ = 25504403040.

The previous prime is 51221343253. The next prime is 51221343311. The reversal of 51221343254 is 45234312215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51221343254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221343253) 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 3 ways as a sum of consecutive naturals, for example, 53133692 + ... + 53134655.

It is an arithmetic number, because the mean of its divisors is an integer number (9643852581).

Almost surely, 2^51221343254 is an apocalyptic number.

51221343254 is a deficient number, since it is larger than the sum of its proper divisors (25929477394).

51221343254 is a wasteful number, since it uses less digits than its factorization.

51221343254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106268590.

The product of its digits is 28800, while the sum is 32.

Adding to 51221343254 its reverse (45234312215), we get a palindrome (96455655469).

The spelling of 51221343254 in words is "fifty-one billion, two hundred twenty-one million, three hundred forty-three thousand, two hundred fifty-four".