51421242 has 8 divisors (see below), whose sum is σ = 102842496. Its totient is φ = 17140412.

The previous prime is 51421229. The next prime is 51421259. The reversal of 51421242 is 24212415.

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

51421242 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4285098 + ... + 4285109.

It is an arithmetic number, because the mean of its divisors is an integer number (12855312).

Almost surely, 2^51421242 is an apocalyptic number.

51421242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51421242 is a wasteful number, since it uses less digits than its factorization.

51421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570212.

The product of its digits is 640, while the sum is 21.

The square root of 51421242 is about 7170.8606178059. The cubic root of 51421242 is about 371.8611893937.

Adding to 51421242 its reverse (24212415), we get a palindrome (75633657).

The spelling of 51421242 in words is "fifty-one million, four hundred twenty-one thousand, two hundred forty-two".