51311241421 has 8 divisors (see below), whose sum is σ = 56416656384. Its totient is φ = 46279285920.

The previous prime is 51311241409. The next prime is 51311241469. The reversal of 51311241421 is 12414211315.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51311241421 - 2¹⁵ = 51311208653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51311241721) 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, 18363400 + ... + 18366193.

It is an arithmetic number, because the mean of its divisors is an integer number (7052082048).

Almost surely, 2^51311241421 is an apocalyptic number.

It is an amenable number.

51311241421 is a deficient number, since it is larger than the sum of its proper divisors (5105414963).

51311241421 is a wasteful number, since it uses less digits than its factorization.

51311241421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36729731.

The product of its digits is 960, while the sum is 25.

Adding to 51311241421 its reverse (12414211315), we get a palindrome (63725452736).

The spelling of 51311241421 in words is "fifty-one billion, three hundred eleven million, two hundred forty-one thousand, four hundred twenty-one".