51120221023 has 8 divisors (see below), whose sum is σ = 51845584896. Its totient is φ = 50395006200.

The previous prime is 51120221003. The next prime is 51120221029. The reversal of 51120221023 is 32012202115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51120221023 is a prime.

It is a super-4 number, since 4×51120221023⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51120221029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779518 + ... + 842548.

It is an arithmetic number, because the mean of its divisors is an integer number (6480698112).

Almost surely, 2^51120221023 is an apocalyptic number.

51120221023 is a deficient number, since it is larger than the sum of its proper divisors (725363873).

51120221023 is a wasteful number, since it uses less digits than its factorization.

51120221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74525.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 51120221023 its reverse (32012202115), we get a palindrome (83132423138).

The spelling of 51120221023 in words is "fifty-one billion, one hundred twenty million, two hundred twenty-one thousand, twenty-three".