51221122 has 4 divisors (see below), whose sum is σ = 76831686. Its totient is φ = 25610560.

The previous prime is 51221101. The next prime is 51221123. The reversal of 51221122 is 22112215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22112215 = 5 ⋅4422443.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 11417641 = 6309^2 + 3379^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51221096 and 51221105.

It is not an unprimeable number, because it can be changed into a prime (51221123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12805279 + ... + 12805282.

Almost surely, 2^51221122 is an apocalyptic number.

51221122 is a deficient number, since it is larger than the sum of its proper divisors (25610564).

51221122 is a wasteful number, since it uses less digits than its factorization.

51221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25610563.

The product of its digits is 80, while the sum is 16.

The square root of 51221122 is about 7156.8933204289. The cubic root of 51221122 is about 371.3781619811.

Adding to 51221122 its reverse (22112215), we get a palindrome (73333337).

The spelling of 51221122 in words is "fifty-one million, two hundred twenty-one thousand, one hundred twenty-two".