51440111121 has 16 divisors (see below), whose sum is σ = 78395993984. Its totient is φ = 29390200704.

The previous prime is 51440111071. The next prime is 51440111167. The reversal of 51440111121 is 12111104415.

51440111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51440111121 - 2⁹ = 51440110609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (51440101121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17260 + ... + 321213.

It is an arithmetic number, because the mean of its divisors is an integer number (4899749624).

Almost surely, 2^51440111121 is an apocalyptic number.

It is an amenable number.

51440111121 is a deficient number, since it is larger than the sum of its proper divisors (26955882863).

51440111121 is a wasteful number, since it uses less digits than its factorization.

51440111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345720.

The product of its (nonzero) digits is 160, while the sum is 21.

Adding to 51440111121 its reverse (12111104415), we get a palindrome (63551215536).

The spelling of 51440111121 in words is "fifty-one billion, four hundred forty million, one hundred eleven thousand, one hundred twenty-one".