51030215355121 has 4 divisors (see below), whose sum is σ = 51866776262644. Its totient is φ = 50193654447600.

The previous prime is 51030215355103. The next prime is 51030215355191. The reversal of 51030215355121 is 12155351203015.

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 2 ways, for example, as 27615697644096 + 23414517711025 = 5255064^2 + 4838855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51030215355121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51030215355101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418280453670 + ... + 418280453791.

It is an arithmetic number, because the mean of its divisors is an integer number (12966694065661).

Almost surely, 2^{51030215355121} is an apocalyptic number.

It is an amenable number.

51030215355121 is a deficient number, since it is larger than the sum of its proper divisors (836560907523).

51030215355121 is an equidigital number, since it uses as much as digits as its factorization.

51030215355121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836560907522.

The product of its (nonzero) digits is 22500, while the sum is 34.

Adding to 51030215355121 its reverse (12155351203015), we get a palindrome (63185566558136).

The spelling of 51030215355121 in words is "fifty-one trillion, thirty billion, two hundred fifteen million, three hundred fifty-five thousand, one hundred twenty-one".