55425401221 has 2 divisors, whose sum is σ = 55425401222. Its totient is φ = 55425401220.

The previous prime is 55425401191. The next prime is 55425401231. The reversal of 55425401221 is 12210452455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55424930625 + 470596 = 235425^2 + 686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55425401221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55425401231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27712700610 + 27712700611.

It is an arithmetic number, because the mean of its divisors is an integer number (27712700611).

Almost surely, 2^55425401221 is an apocalyptic number.

It is an amenable number.

55425401221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55425401221 is an equidigital number, since it uses as much as digits as its factorization.

55425401221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 55425401221 its reverse (12210452455), we get a palindrome (67635853676).

The spelling of 55425401221 in words is "fifty-five billion, four hundred twenty-five million, four hundred one thousand, two hundred twenty-one".