51021321201 has 16 divisors (see below), whose sum is σ = 78025438720. Its totient is φ = 32916980880.

The previous prime is 51021321163. The next prime is 51021321223. The reversal of 51021321201 is 10212312015.

51021321201 is a `hidden beast` number, since 510 + 2 + 1 + 32 + 120 + 1 = 666.

It is not a de Polignac number, because 51021321201 - 2¹⁵ = 51021288433 is a prime.

It is a super-2 number, since 2×51021321201² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51021326201) 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, 30477850 + ... + 30479523.

It is an arithmetic number, because the mean of its divisors is an integer number (4876589920).

Almost surely, 2^51021321201 is an apocalyptic number.

It is an amenable number.

51021321201 is a deficient number, since it is larger than the sum of its proper divisors (27004117519).

51021321201 is a wasteful number, since it uses less digits than its factorization.

51021321201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60957413 (or 60957407 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 51021321201 its reverse (10212312015), we get a palindrome (61233633216).

The spelling of 51021321201 in words is "fifty-one billion, twenty-one million, three hundred twenty-one thousand, two hundred one".