51223024121 has 4 divisors (see below), whose sum is σ = 51259379700. Its totient is φ = 51186668544.

The previous prime is 51223024063. The next prime is 51223024123. The reversal of 51223024121 is 12142032215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12142032215 = 5 ⋅2428406443.

It can be written as a sum of positive squares in 2 ways, for example, as 659205625 + 50563818496 = 25675^2 + 224864^2 .

It is a cyclic number.

It is not a de Polignac number, because 51223024121 - 2²² = 51218829817 is a prime.

It is a super-3 number, since 3×51223024121³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51223024123) 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, 18175676 + ... + 18178493.

It is an arithmetic number, because the mean of its divisors is an integer number (12814844925).

Almost surely, 2^51223024121 is an apocalyptic number.

It is an amenable number.

51223024121 is a deficient number, since it is larger than the sum of its proper divisors (36355579).

51223024121 is a wasteful number, since it uses less digits than its factorization.

51223024121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36355578.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 51223024121 its reverse (12142032215), we get a palindrome (63365056336).

The spelling of 51223024121 in words is "fifty-one billion, two hundred twenty-three million, twenty-four thousand, one hundred twenty-one".