54121322221 has 4 divisors (see below), whose sum is σ = 54127837852. Its totient is φ = 54114806592.

The previous prime is 54121322183. The next prime is 54121322261. The reversal of 54121322221 is 12222312145.

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 28018072996 + 26103249225 = 167386^2 + 161565^2 .

It is a cyclic number.

It is not a de Polignac number, because 54121322221 - 2¹⁷ = 54121191149 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 (54121322261) 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, 3245340 + ... + 3261973.

It is an arithmetic number, because the mean of its divisors is an integer number (13531959463).

Almost surely, 2^54121322221 is an apocalyptic number.

It is an amenable number.

54121322221 is a deficient number, since it is larger than the sum of its proper divisors (6515631).

54121322221 is an equidigital number, since it uses as much as digits as its factorization.

54121322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6515630.

The product of its digits is 1920, while the sum is 25.

Adding to 54121322221 its reverse (12222312145), we get a palindrome (66343634366).

The spelling of 54121322221 in words is "fifty-four billion, one hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty-one".