51621122 has 16 divisors (see below), whose sum is σ = 89040192. Its totient is φ = 21986640.

The previous prime is 51621121. The next prime is 51621127. The reversal of 51621122 is 22112615.

It is a junction number, because it is equal to n+sod(n) for n = 51621094 and 51621103.

It is not an unprimeable number, because it can be changed into a prime (51621121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9029 + ... + 13592.

It is an arithmetic number, because the mean of its divisors is an integer number (5565012).

Almost surely, 2^51621122 is an apocalyptic number.

51621122 is a deficient number, since it is larger than the sum of its proper divisors (37419070).

51621122 is a wasteful number, since it uses less digits than its factorization.

51621122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22793.

The product of its digits is 240, while the sum is 20.

The square root of 51621122 is about 7184.7840607773. The cubic root of 51621122 is about 372.3423881652.

Adding to 51621122 its reverse (22112615), we get a palindrome (73733737).

The spelling of 51621122 in words is "fifty-one million, six hundred twenty-one thousand, one hundred twenty-two".