51021232403 has 4 divisors (see below), whose sum is σ = 51472747848. Its totient is φ = 50569716960.

The previous prime is 51021232387. The next prime is 51021232433. The reversal of 51021232403 is 30423212015.

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

It is a cyclic number.

It is not a de Polignac number, because 51021232403 - 2⁴ = 51021232387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51021232433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225757553 + ... + 225757778.

It is an arithmetic number, because the mean of its divisors is an integer number (12868186962).

Almost surely, 2^51021232403 is an apocalyptic number.

51021232403 is a deficient number, since it is larger than the sum of its proper divisors (451515445).

51021232403 is a wasteful number, since it uses less digits than its factorization.

51021232403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451515444.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 51021232403 its reverse (30423212015), we get a palindrome (81444444418).

The spelling of 51021232403 in words is "fifty-one billion, twenty-one million, two hundred thirty-two thousand, four hundred three".