53724453221 has 2 divisors, whose sum is σ = 53724453222. Its totient is φ = 53724453220.

The previous prime is 53724453217. The next prime is 53724453241. The reversal of 53724453221 is 12235442735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49511145121 + 4213308100 = 222511^2 + 64910^2 .

It is a cyclic number.

It is not a de Polignac number, because 53724453221 - 2² = 53724453217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53724453241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26862226610 + 26862226611.

It is an arithmetic number, because the mean of its divisors is an integer number (26862226611).

Almost surely, 2^53724453221 is an apocalyptic number.

It is an amenable number.

53724453221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53724453221 is an equidigital number, since it uses as much as digits as its factorization.

53724453221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 38.

Adding to 53724453221 its reverse (12235442735), we get a palindrome (65959895956).

The spelling of 53724453221 in words is "fifty-three billion, seven hundred twenty-four million, four hundred fifty-three thousand, two hundred twenty-one".