55421443521251 has 2 divisors, whose sum is σ = 55421443521252. Its totient is φ = 55421443521250.

The previous prime is 55421443521239. The next prime is 55421443521293. The reversal of 55421443521251 is 15212534412455.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55421443521251 is a prime.

It is not a weakly prime, because it can be changed into another prime (55421443521551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710721760625 + 27710721760626.

It is an arithmetic number, because the mean of its divisors is an integer number (27710721760626).

Almost surely, 2^{55421443521251} is an apocalyptic number.

55421443521251 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421443521251 is an equidigital number, since it uses as much as digits as its factorization.

55421443521251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960000, while the sum is 44.

The spelling of 55421443521251 in words is "fifty-five trillion, four hundred twenty-one billion, four hundred forty-three million, five hundred twenty-one thousand, two hundred fifty-one".