21514870477 has 2 divisors, whose sum is σ = 21514870478. Its totient is φ = 21514870476.

The previous prime is 21514870441. The next prime is 21514870529. The reversal of 21514870477 is 77407841512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17028684036 + 4486186441 = 130494^2 + 66979^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514870477 - 2¹¹ = 21514868429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514874477) 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, 10757435238 + 10757435239.

It is an arithmetic number, because the mean of its divisors is an integer number (10757435239).

Almost surely, 2^21514870477 is an apocalyptic number.

It is an amenable number.

21514870477 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514870477 is an equidigital number, since it uses as much as digits as its factorization.

21514870477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 21514870477 in words is "twenty-one billion, five hundred fourteen million, eight hundred seventy thousand, four hundred seventy-seven".