5135331221 has 4 divisors (see below), whose sum is σ = 5260583244. Its totient is φ = 5010079200.

The previous prime is 5135331203. The next prime is 5135331251. The reversal of 5135331221 is 1221335315.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1268356996 + 3866974225 = 35614^2 + 62185^2 .

It is a cyclic number.

It is not a de Polignac number, because 5135331221 - 2²² = 5131136917 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 (5135331251) 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, 62625950 + ... + 62626031.

It is an arithmetic number, because the mean of its divisors is an integer number (1315145811).

Almost surely, 2^5135331221 is an apocalyptic number.

It is an amenable number.

5135331221 is a deficient number, since it is larger than the sum of its proper divisors (125252023).

5135331221 is a wasteful number, since it uses less digits than its factorization.

5135331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125252022.

The product of its digits is 2700, while the sum is 26.

The square root of 5135331221 is about 71661.2253663025. The cubic root of 5135331221 is about 1725.2663562375.

Adding to 5135331221 its reverse (1221335315), we get a palindrome (6356666536).

The spelling of 5135331221 in words is "five billion, one hundred thirty-five million, three hundred thirty-one thousand, two hundred twenty-one".