51231201222 has 16 divisors (see below), whose sum is σ = 103759395840. Its totient is φ = 16860901512.

The previous prime is 51231201199. The next prime is 51231201253. The reversal of 51231201222 is 22210213215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54040878 + ... + 54041825.

It is an arithmetic number, because the mean of its divisors is an integer number (6484962240).

Almost surely, 2^51231201222 is an apocalyptic number.

51231201222 is an abundant number, since it is smaller than the sum of its proper divisors (52528194618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51231201222 is a wasteful number, since it uses less digits than its factorization.

51231201222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108082787.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 51231201222 its reverse (22210213215), we get a palindrome (73441414437).

The spelling of 51231201222 in words is "fifty-one billion, two hundred thirty-one million, two hundred one thousand, two hundred twenty-two".