51002111257321 has 16 divisors (see below), whose sum is σ = 58747794866176. Its totient is φ = 43371352853136.

The previous prime is 51002111257301. The next prime is 51002111257373. The reversal of 51002111257321 is 12375211120015.

It is not a de Polignac number, because 51002111257321 - 2¹⁵ = 51002111224553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51002111257301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85747270 + ... + 86340016.

It is an arithmetic number, because the mean of its divisors is an integer number (3671737179136).

Almost surely, 2^{51002111257321} is an apocalyptic number.

It is an amenable number.

51002111257321 is a deficient number, since it is larger than the sum of its proper divisors (7745683608855).

51002111257321 is a wasteful number, since it uses less digits than its factorization.

51002111257321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689668.

The product of its (nonzero) digits is 4200, while the sum is 31.

Adding to 51002111257321 its reverse (12375211120015), we get a palindrome (63377322377336).

The spelling of 51002111257321 in words is "fifty-one trillion, two billion, one hundred eleven million, two hundred fifty-seven thousand, three hundred twenty-one".