51111125420 has 24 divisors (see below), whose sum is σ = 107344672848. Its totient is φ = 20442296000.

The previous prime is 51111125369. The next prime is 51111125423. The reversal of 51111125420 is 2452111115.

It is a happy number.

It is a super-2 number, since 2×51111125420² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51111125423) 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, 67310 + ... + 326730.

It is an arithmetic number, because the mean of its divisors is an integer number (4472694702).

Almost surely, 2^51111125420 is an apocalyptic number.

It is an amenable number.

51111125420 is an abundant number, since it is smaller than the sum of its proper divisors (56233547428).

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

51111125420 is a wasteful number, since it uses less digits than its factorization.

51111125420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269281 (or 269279 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

Adding to 51111125420 its reverse (2452111115), we get a palindrome (53563236535).

The spelling of 51111125420 in words is "fifty-one billion, one hundred eleven million, one hundred twenty-five thousand, four hundred twenty".