51335623221 has 8 divisors (see below), whose sum is σ = 68472371520. Its totient is φ = 34211311872.

The previous prime is 51335623201. The next prime is 51335623253. The reversal of 51335623221 is 12232653315.

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

It is not a de Polignac number, because 51335623221 - 2¹³ = 51335615029 is a prime.

It is a super-2 number, since 2×51335623221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51335623201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3099601 + ... + 3116118.

It is an arithmetic number, because the mean of its divisors is an integer number (8559046440).

Almost surely, 2^51335623221 is an apocalyptic number.

It is an amenable number.

51335623221 is a deficient number, since it is larger than the sum of its proper divisors (17136748299).

51335623221 is a wasteful number, since it uses less digits than its factorization.

51335623221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218475.

The product of its digits is 32400, while the sum is 33.

The spelling of 51335623221 in words is "fifty-one billion, three hundred thirty-five million, six hundred twenty-three thousand, two hundred twenty-one".