51221450 has 24 divisors (see below), whose sum is σ = 108882912. Its totient is φ = 17561520.

The previous prime is 51221441. The next prime is 51221491. The reversal of 51221450 is 5412215.

51221450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 72824 + ... + 73523.

It is an arithmetic number, because the mean of its divisors is an integer number (4536788).

Almost surely, 2^51221450 is an apocalyptic number.

51221450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51221450 is an abundant number, since it is smaller than the sum of its proper divisors (57661462).

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

51221450 is a wasteful number, since it uses less digits than its factorization.

51221450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146366 (or 146361 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 51221450 is about 7156.9162353628. The cubic root of 51221450 is about 371.3789546995.

Adding to 51221450 its reverse (5412215), we get a palindrome (56633665).

The spelling of 51221450 in words is "fifty-one million, two hundred twenty-one thousand, four hundred fifty".