55421221353481 has 2 divisors, whose sum is σ = 55421221353482. Its totient is φ = 55421221353480.

The previous prime is 55421221353479. The next prime is 55421221353569. The reversal of 55421221353481 is 18435312212455.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49367205392400 + 6054015961081 = 7026180^2 + 2460491^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421221353481 - 2¹ = 55421221353479 is a prime.

It is a super-2 number, since 2×55421221353481² (a number of 28 digits) contains 22 as substring.

Together with 55421221353479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55421221354481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710610676740 + 27710610676741.

It is an arithmetic number, because the mean of its divisors is an integer number (27710610676741).

Almost surely, 2^{55421221353481} is an apocalyptic number.

It is an amenable number.

55421221353481 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421221353481 is an equidigital number, since it uses as much as digits as its factorization.

55421221353481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 46.

The spelling of 55421221353481 in words is "fifty-five trillion, four hundred twenty-one billion, two hundred twenty-one million, three hundred fifty-three thousand, four hundred eighty-one".