51220251333 has 24 divisors (see below), whose sum is σ = 74171235840. Its totient is φ = 34060875840.

The previous prime is 51220251331. The next prime is 51220251349. The reversal of 51220251333 is 33315202215.

It is a happy number.

It is not a de Polignac number, because 51220251333 - 2¹ = 51220251331 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51220251297 and 51220251306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51220251331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15103068 + ... + 15106458.

It is an arithmetic number, because the mean of its divisors is an integer number (3090468160).

Almost surely, 2^51220251333 is an apocalyptic number.

It is an amenable number.

51220251333 is a deficient number, since it is larger than the sum of its proper divisors (22950984507).

51220251333 is a wasteful number, since it uses less digits than its factorization.

51220251333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129 (or 7126 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 51220251333 its reverse (33315202215), we get a palindrome (84535453548).

The spelling of 51220251333 in words is "fifty-one billion, two hundred twenty million, two hundred fifty-one thousand, three hundred thirty-three".