51217420522 has 4 divisors (see below), whose sum is σ = 76826130786. Its totient is φ = 25608710260.

The previous prime is 51217420483. The next prime is 51217420523. The reversal of 51217420522 is 22502471215.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 32148848601 + 19068571921 = 179301^2 + 138089^2 .

It is not an unprimeable number, because it can be changed into a prime (51217420523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12804355129 + ... + 12804355132.

Almost surely, 2^51217420522 is an apocalyptic number.

51217420522 is a deficient number, since it is larger than the sum of its proper divisors (25608710264).

51217420522 is a wasteful number, since it uses less digits than its factorization.

51217420522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25608710263.

The product of its (nonzero) digits is 11200, while the sum is 31.

Adding to 51217420522 its reverse (22502471215), we get a palindrome (73719891737).

The spelling of 51217420522 in words is "fifty-one billion, two hundred seventeen million, four hundred twenty thousand, five hundred twenty-two".