51245221233 has 64 divisors (see below), whose sum is σ = 74646978560. Its totient is φ = 31164715008.

The previous prime is 51245221219. The next prime is 51245221259. The reversal of 51245221233 is 33212254215.

It is not a de Polignac number, because 51245221233 - 2¹⁰ = 51245220209 is a prime.

It is a super-2 number, since 2×51245221233² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51245221233.

It is not an unprimeable number, because it can be changed into a prime (51245221933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60076035 + ... + 60076887.

It is an arithmetic number, because the mean of its divisors is an integer number (1166359040).

Almost surely, 2^51245221233 is an apocalyptic number.

It is an amenable number.

51245221233 is a deficient number, since it is larger than the sum of its proper divisors (23401757327).

51245221233 is a wasteful number, since it uses less digits than its factorization.

51245221233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its digits is 14400, while the sum is 30.

Adding to 51245221233 its reverse (33212254215), we get a palindrome (84457475448).

The spelling of 51245221233 in words is "fifty-one billion, two hundred forty-five million, two hundred twenty-one thousand, two hundred thirty-three".