51441350221 has 4 divisors (see below), whose sum is σ = 51482537500. Its totient is φ = 51400162944.

The previous prime is 51441350161. The next prime is 51441350267. The reversal of 51441350221 is 12205314415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32996722500 + 18444627721 = 181650^2 + 135811^2 .

It is a cyclic number.

It is not a de Polignac number, because 51441350221 - 2²¹ = 51439253069 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 51441350221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51441350021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20591766 + ... + 20594263.

It is an arithmetic number, because the mean of its divisors is an integer number (12870634375).

Almost surely, 2^51441350221 is an apocalyptic number.

It is an amenable number.

51441350221 is a deficient number, since it is larger than the sum of its proper divisors (41187279).

51441350221 is a wasteful number, since it uses less digits than its factorization.

51441350221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41187278.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 51441350221 its reverse (12205314415), we get a palindrome (63646664636).

The spelling of 51441350221 in words is "fifty-one billion, four hundred forty-one million, three hundred fifty thousand, two hundred twenty-one".