51151523232121 has 4 divisors (see below), whose sum is σ = 55086255788452. Its totient is φ = 47216790675792.

The previous prime is 51151523232119. The next prime is 51151523232167. The reversal of 51151523232121 is 12123232515115.

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 16636650228025 + 34514873004096 = 4078805^2 + 5874936^2 .

It is a cyclic number.

It is not a de Polignac number, because 51151523232121 - 2¹ = 51151523232119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51151523232721) 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, 1967366278146 + ... + 1967366278171.

It is an arithmetic number, because the mean of its divisors is an integer number (13771563947113).

Almost surely, 2^{51151523232121} is an apocalyptic number.

It is an amenable number.

51151523232121 is a deficient number, since it is larger than the sum of its proper divisors (3934732556331).

51151523232121 is a wasteful number, since it uses less digits than its factorization.

51151523232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934732556330.

The product of its digits is 18000, while the sum is 34.

Adding to 51151523232121 its reverse (12123232515115), we get a palindrome (63274755747236).

The spelling of 51151523232121 in words is "fifty-one trillion, one hundred fifty-one billion, five hundred twenty-three million, two hundred thirty-two thousand, one hundred twenty-one".