51455221201 has 4 divisors (see below), whose sum is σ = 51505130304. Its totient is φ = 51405312100.

The previous prime is 51455221183. The next prime is 51455221211. The reversal of 51455221201 is 10212255415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51455221201 - 2³³ = 42865286609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51455221201.

It is not an unprimeable number, because it can be changed into a prime (51455221211) 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 3 ways as a sum of consecutive naturals, for example, 24953005 + ... + 24955066.

It is an arithmetic number, because the mean of its divisors is an integer number (12876282576).

Almost surely, 2^51455221201 is an apocalyptic number.

It is an amenable number.

51455221201 is a deficient number, since it is larger than the sum of its proper divisors (49909103).

51455221201 is a wasteful number, since it uses less digits than its factorization.

51455221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49909102.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 51455221201 its reverse (10212255415), we get a palindrome (61667476616).

The spelling of 51455221201 in words is "fifty-one billion, four hundred fifty-five million, two hundred twenty-one thousand, two hundred one".