51435123421 has 8 divisors (see below), whose sum is σ = 59064256800. Its totient is φ = 44298192240.

The previous prime is 51435123413. The next prime is 51435123511. The reversal of 51435123421 is 12432153415.

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 51435123421 - 2³ = 51435123413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51435127421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123050326 + ... + 123050743.

It is an arithmetic number, because the mean of its divisors is an integer number (7383032100).

Almost surely, 2^51435123421 is an apocalyptic number.

It is an amenable number.

51435123421 is a deficient number, since it is larger than the sum of its proper divisors (7629133379).

51435123421 is a wasteful number, since it uses less digits than its factorization.

51435123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246101099.

The product of its digits is 14400, while the sum is 31.

Adding to 51435123421 its reverse (12432153415), we get a palindrome (63867276836).

The spelling of 51435123421 in words is "fifty-one billion, four hundred thirty-five million, one hundred twenty-three thousand, four hundred twenty-one".