55252430221 has 4 divisors (see below), whose sum is σ = 55254811744. Its totient is φ = 55250048700.

The previous prime is 55252430173. The next prime is 55252430237. The reversal of 55252430221 is 12203425255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55252430221 - 2⁹ = 55252429709 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 (55252430921) 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, 1155615 + ... + 1202476.

It is an arithmetic number, because the mean of its divisors is an integer number (13813702936).

Almost surely, 2^55252430221 is an apocalyptic number.

It is an amenable number.

55252430221 is a deficient number, since it is larger than the sum of its proper divisors (2381523).

55252430221 is a wasteful number, since it uses less digits than its factorization.

55252430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381522.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 55252430221 its reverse (12203425255), we get a palindrome (67455855476).

The spelling of 55252430221 in words is "fifty-five billion, two hundred fifty-two million, four hundred thirty thousand, two hundred twenty-one".