21848288477 has 2 divisors, whose sum is σ = 21848288478. Its totient is φ = 21848288476.

The previous prime is 21848288459. The next prime is 21848288489. The reversal of 21848288477 is 77488284812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17105762521 + 4742525956 = 130789^2 + 68866^2 .

It is a cyclic number.

It is not a de Polignac number, because 21848288477 - 2²⁰ = 21847239901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21848288437) 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, 10924144238 + 10924144239.

It is an arithmetic number, because the mean of its divisors is an integer number (10924144239).

Almost surely, 2^21848288477 is an apocalyptic number.

It is an amenable number.

21848288477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21848288477 is an equidigital number, since it uses as much as digits as its factorization.

21848288477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12845056, while the sum is 59.

The spelling of 21848288477 in words is "twenty-one billion, eight hundred forty-eight million, two hundred eighty-eight thousand, four hundred seventy-seven".