51221522 has 8 divisors (see below), whose sum is σ = 83817072. Its totient is φ = 23282500.

The previous prime is 51221509. The next prime is 51221531. The reversal of 51221522 is 22512215.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 51221494 and 51221503.

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, 1164104 + ... + 1164147.

It is an arithmetic number, because the mean of its divisors is an integer number (10477134).

Almost surely, 2^51221522 is an apocalyptic number.

51221522 is a deficient number, since it is larger than the sum of its proper divisors (32595550).

51221522 is a wasteful number, since it uses less digits than its factorization.

51221522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328264.

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

The square root of 51221522 is about 7156.9212654604. The cubic root of 51221522 is about 371.3791287104.

Adding to 51221522 its reverse (22512215), we get a palindrome (73733737).

The spelling of 51221522 in words is "fifty-one million, two hundred twenty-one thousand, five hundred twenty-two".