54204137221 has 4 divisors (see below), whose sum is σ = 58373686252. Its totient is φ = 50034588192.

The previous prime is 54204137189. The next prime is 54204137227. The reversal of 54204137221 is 12273140245.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12273140245 = 5 ⋅2454628049.

It can be written as a sum of positive squares in 2 ways, for example, as 32118016225 + 22086120996 = 179215^2 + 148614^2 .

It is a cyclic number.

It is not a de Polignac number, because 54204137221 - 2⁵ = 54204137189 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 (54204137227) 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, 2084774496 + ... + 2084774521.

It is an arithmetic number, because the mean of its divisors is an integer number (14593421563).

Almost surely, 2^54204137221 is an apocalyptic number.

It is an amenable number.

54204137221 is a deficient number, since it is larger than the sum of its proper divisors (4169549031).

54204137221 is a wasteful number, since it uses less digits than its factorization.

54204137221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4169549030.

The product of its (nonzero) digits is 13440, while the sum is 31.

Adding to 54204137221 its reverse (12273140245), we get a palindrome (66477277466).

The spelling of 54204137221 in words is "fifty-four billion, two hundred four million, one hundred thirty-seven thousand, two hundred twenty-one".