51255421012 has 12 divisors (see below), whose sum is σ = 89698727776. Its totient is φ = 25627213080.

The previous prime is 51255420947. The next prime is 51255421033. The reversal of 51255421012 is 21012455215.

It is a super-2 number, since 2×51255421012² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203563 + ... + 379405.

Almost surely, 2^51255421012 is an apocalyptic number.

It is an amenable number.

51255421012 is a deficient number, since it is larger than the sum of its proper divisors (38443306764).

51255421012 is a wasteful number, since it uses less digits than its factorization.

51255421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248718 (or 248716 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 51255421012 its reverse (21012455215), we get a palindrome (72267876227).

The spelling of 51255421012 in words is "fifty-one billion, two hundred fifty-five million, four hundred twenty-one thousand, twelve".