51671221 has 8 divisors (see below), whose sum is σ = 59662400. Its totient is φ = 43832448.

The previous prime is 51671201. The next prime is 51671227. The reversal of 51671221 is 12217615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51671221 - 2¹¹ = 51669173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51671227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37371 + ... + 38728.

It is an arithmetic number, because the mean of its divisors is an integer number (7457800).

Almost surely, 2^51671221 is an apocalyptic number.

It is an amenable number.

51671221 is a deficient number, since it is larger than the sum of its proper divisors (7991179).

51671221 is an equidigital number, since it uses as much as digits as its factorization.

51671221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76203.

The product of its digits is 840, while the sum is 25.

The square root of 51671221 is about 7188.2696805281. The cubic root of 51671221 is about 372.4628036669.

Adding to 51671221 its reverse (12217615), we get a palindrome (63888836).

The spelling of 51671221 in words is "fifty-one million, six hundred seventy-one thousand, two hundred twenty-one".