51342221 has 8 divisors (see below), whose sum is σ = 58750080. Its totient is φ = 43952688.

The previous prime is 51342217. The next prime is 51342253. The reversal of 51342221 is 12224315.

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 51342221 - 2² = 51342217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51342193 and 51342202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51342281) 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, 2075 + ... + 10343.

It is an arithmetic number, because the mean of its divisors is an integer number (7343760).

Almost surely, 2^51342221 is an apocalyptic number.

It is an amenable number.

51342221 is a deficient number, since it is larger than the sum of its proper divisors (7407859).

51342221 is an equidigital number, since it uses as much as digits as its factorization.

51342221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9163.

The product of its digits is 480, while the sum is 20.

The square root of 51342221 is about 7165.3486307367. The cubic root of 51342221 is about 371.6706072721.

Adding to 51342221 its reverse (12224315), we get a palindrome (63566536).

The spelling of 51342221 in words is "fifty-one million, three hundred forty-two thousand, two hundred twenty-one".