55453530051221 has 2 divisors, whose sum is σ = 55453530051222. Its totient is φ = 55453530051220.

The previous prime is 55453530051211. The next prime is 55453530051239. The reversal of 55453530051221 is 12215003535455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28602323356996 + 26851206694225 = 5348114^2 + 5181815^2 .

It is a cyclic number.

It is not a de Polignac number, because 55453530051221 - 2³⁸ = 55178652144277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55453530051211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27726765025610 + 27726765025611.

It is an arithmetic number, because the mean of its divisors is an integer number (27726765025611).

Almost surely, 2^{55453530051221} is an apocalyptic number.

It is an amenable number.

55453530051221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55453530051221 is an equidigital number, since it uses as much as digits as its factorization.

55453530051221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450000, while the sum is 41.

Adding to 55453530051221 its reverse (12215003535455), we get a palindrome (67668533586676).

The spelling of 55453530051221 in words is "fifty-five trillion, four hundred fifty-three billion, five hundred thirty million, fifty-one thousand, two hundred twenty-one".