5121531421 has 8 divisors (see below), whose sum is σ = 5341247744. Its totient is φ = 4905221760.

The previous prime is 5121531419. The next prime is 5121531487. The reversal of 5121531421 is 1241351215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5121531421 - 2¹ = 5121531419 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 (5121531721) 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, 848595 + ... + 854608.

It is an arithmetic number, because the mean of its divisors is an integer number (667655968).

Almost surely, 2^5121531421 is an apocalyptic number.

It is an amenable number.

5121531421 is a deficient number, since it is larger than the sum of its proper divisors (219716323).

5121531421 is a wasteful number, since it uses less digits than its factorization.

5121531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703331.

The product of its digits is 1200, while the sum is 25.

The square root of 5121531421 is about 71564.8756094776. The cubic root of 5121531421 is about 1723.7195758605.

Adding to 5121531421 its reverse (1241351215), we get a palindrome (6362882636).

The spelling of 5121531421 in words is "five billion, one hundred twenty-one million, five hundred thirty-one thousand, four hundred twenty-one".