51322166021 has 8 divisors (see below), whose sum is σ = 58662359424. Its totient is φ = 43984086480.

The previous prime is 51322166003. The next prime is 51322166023. The reversal of 51322166021 is 12066122315.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51322166021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51322166023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476090 + ... + 573851.

It is an arithmetic number, because the mean of its divisors is an integer number (7332794928).

Almost surely, 2^51322166021 is an apocalyptic number.

It is an amenable number.

51322166021 is a deficient number, since it is larger than the sum of its proper divisors (7340193403).

51322166021 is a wasteful number, since it uses less digits than its factorization.

51322166021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056931.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 51322166021 its reverse (12066122315), we get a palindrome (63388288336).

The spelling of 51322166021 in words is "fifty-one billion, three hundred twenty-two million, one hundred sixty-six thousand, twenty-one".