51727221 has 64 divisors (see below), whose sum is σ = 97036800. Its totient is φ = 26500608.

The previous prime is 51727217. The next prime is 51727229. The reversal of 51727221 is 12272715.

It is not a de Polignac number, because 51727221 - 2² = 51727217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51727229) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90625 + ... + 91193.

It is an arithmetic number, because the mean of its divisors is an integer number (1516200).

Almost surely, 2^51727221 is an apocalyptic number.

It is an amenable number.

51727221 is a deficient number, since it is larger than the sum of its proper divisors (45309579).

51727221 is a wasteful number, since it uses less digits than its factorization.

51727221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 629 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 51727221 is about 7192.1638607585. The cubic root of 51727221 is about 372.5973104325.

Adding to 51727221 its reverse (12272715), we get a palindrome (63999936).

The spelling of 51727221 in words is "fifty-one million, seven hundred twenty-seven thousand, two hundred twenty-one".