5121535621 has 4 divisors (see below), whose sum is σ = 5230504512. Its totient is φ = 5012566732.

The previous prime is 5121535613. The next prime is 5121535631. The reversal of 5121535621 is 1265351215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5121535621 - 2³ = 5121535613 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 (5121535631) 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, 54484375 + ... + 54484468.

It is an arithmetic number, because the mean of its divisors is an integer number (1307626128).

Almost surely, 2^5121535621 is an apocalyptic number.

It is an amenable number.

5121535621 is a deficient number, since it is larger than the sum of its proper divisors (108968891).

5121535621 is a wasteful number, since it uses less digits than its factorization.

5121535621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108968890.

The product of its digits is 9000, while the sum is 31.

The square root of 5121535621 is about 71564.9049534756. The cubic root of 5121535621 is about 1723.7200470490.

Adding to 5121535621 its reverse (1265351215), we get a palindrome (6386886836).

The spelling of 5121535621 in words is "five billion, one hundred twenty-one million, five hundred thirty-five thousand, six hundred twenty-one".