51030012221 has 4 divisors (see below), whose sum is σ = 51030496512. Its totient is φ = 51029527932.

The previous prime is 51030012211. The next prime is 51030012233. The reversal of 51030012221 is 12221003015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51030012221 - 2¹⁸ = 51029750077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51030012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51030012211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9731 + ... + 319616.

It is an arithmetic number, because the mean of its divisors is an integer number (12757624128).

Almost surely, 2^51030012221 is an apocalyptic number.

It is an amenable number.

51030012221 is a deficient number, since it is larger than the sum of its proper divisors (484291).

51030012221 is a wasteful number, since it uses less digits than its factorization.

51030012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484290.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 51030012221 its reverse (12221003015), we get a palindrome (63251015236).

The spelling of 51030012221 in words is "fifty-one billion, thirty million, twelve thousand, two hundred twenty-one".