5105521421 has 32 divisors (see below), whose sum is σ = 6861324288. Its totient is φ = 3668898240.

The previous prime is 5105521411. The next prime is 5105521423. The reversal of 5105521421 is 1241255015.

It is not a de Polignac number, because 5105521421 - 2¹⁸ = 5105259277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5105521423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1663130 + ... + 1666196.

It is an arithmetic number, because the mean of its divisors is an integer number (214416384).

Almost surely, 2^5105521421 is an apocalyptic number.

It is an amenable number.

5105521421 is a deficient number, since it is larger than the sum of its proper divisors (1755802867).

5105521421 is a wasteful number, since it uses less digits than its factorization.

5105521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4761.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 5105521421 is about 71452.9315073916. The cubic root of 5105521421 is about 1721.9215748224.

Adding to 5105521421 its reverse (1241255015), we get a palindrome (6346776436).

The spelling of 5105521421 in words is "five billion, one hundred five million, five hundred twenty-one thousand, four hundred twenty-one".