50123421520 has 40 divisors (see below), whose sum is σ = 123392073384. Its totient is φ = 18869993472.

The previous prime is 50123421487. The next prime is 50123421521. The reversal of 50123421520 is 2512432105.

It can be written as a sum of positive squares in 4 ways, for example, as 1501407504 + 48622014016 = 38748^2 + 220504^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×50123421520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (50123421521) 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, 18426369 + ... + 18429088.

Almost surely, 2^50123421520 is an apocalyptic number.

It is an amenable number.

50123421520 is an abundant number, since it is smaller than the sum of its proper divisors (73268651864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

50123421520 is a wasteful number, since it uses less digits than its factorization.

50123421520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36855487 (or 36855481 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 50123421520 its reverse (2512432105), we get a palindrome (52635853625).

The spelling of 50123421520 in words is "fifty billion, one hundred twenty-three million, four hundred twenty-one thousand, five hundred twenty".