51021242 has 8 divisors (see below), whose sum is σ = 76852800. Its totient is φ = 25403644.

The previous prime is 51021241. The next prime is 51021307. The reversal of 51021242 is 24212015.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51021242.

It is not an unprimeable number, because it can be changed into a prime (51021241) 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, 52892 + ... + 53847.

It is an arithmetic number, because the mean of its divisors is an integer number (9606600).

Almost surely, 2^51021242 is an apocalyptic number.

51021242 is a deficient number, since it is larger than the sum of its proper divisors (25831558).

51021242 is a wasteful number, since it uses less digits than its factorization.

51021242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106980.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 51021242 is about 7142.9155111901. The cubic root of 51021242 is about 370.8944563586.

Adding to 51021242 its reverse (24212015), we get a palindrome (75233257).

The spelling of 51021242 in words is "fifty-one million, twenty-one thousand, two hundred forty-two".