54521051221 has 32 divisors (see below), whose sum is σ = 70132688640. Its totient is φ = 41220458496.

The previous prime is 54521051213. The next prime is 54521051243. The reversal of 54521051221 is 12215012545.

54521051221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 54521051221 - 2³ = 54521051213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54521051221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54521051821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149490 + ... + 362476.

It is an arithmetic number, because the mean of its divisors is an integer number (2191646520).

Almost surely, 2^54521051221 is an apocalyptic number.

It is an amenable number.

54521051221 is a deficient number, since it is larger than the sum of its proper divisors (15611637419).

54521051221 is a wasteful number, since it uses less digits than its factorization.

54521051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213133.

The product of its (nonzero) digits is 4000, while the sum is 28.

Adding to 54521051221 its reverse (12215012545), we get a palindrome (66736063766).

The spelling of 54521051221 in words is "fifty-four billion, five hundred twenty-one million, fifty-one thousand, two hundred twenty-one".