51423230421133 has 4 divisors (see below), whose sum is σ = 52813047459580. Its totient is φ = 50033413382688.

The previous prime is 51423230421109. The next prime is 51423230421137. The reversal of 51423230421133 is 33112403232415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47554857376009 + 3868373045124 = 6896003^2 + 1966818^2 .

It is a cyclic number.

It is not a de Polignac number, because 51423230421133 - 2²¹ = 51423228323981 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 (51423230421137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694908519168 + ... + 694908519241.

It is an arithmetic number, because the mean of its divisors is an integer number (13203261864895).

Almost surely, 2^{51423230421133} is an apocalyptic number.

It is an amenable number.

51423230421133 is a deficient number, since it is larger than the sum of its proper divisors (1389817038447).

51423230421133 is a wasteful number, since it uses less digits than its factorization.

51423230421133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389817038446.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 51423230421133 its reverse (33112403232415), we get a palindrome (84535633653548).

The spelling of 51423230421133 in words is "fifty-one trillion, four hundred twenty-three billion, two hundred thirty million, four hundred twenty-one thousand, one hundred thirty-three".