51221302 has 32 divisors (see below), whose sum is σ = 88744320. Its totient is φ = 21928320.

The previous prime is 51221297. The next prime is 51221327. The reversal of 51221302 is 20312215.

51221302 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118078 + ... + 118510.

It is an arithmetic number, because the mean of its divisors is an integer number (2773260).

Almost surely, 2^51221302 is an apocalyptic number.

51221302 is a deficient number, since it is larger than the sum of its proper divisors (37523018).

51221302 is a wasteful number, since it uses less digits than its factorization.

51221302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51221302 is about 7156.9058957066. The cubic root of 51221302 is about 371.3785970099.

Adding to 51221302 its reverse (20312215), we get a palindrome (71533517).

The spelling of 51221302 in words is "fifty-one million, two hundred twenty-one thousand, three hundred two".