21483228517 has 2 divisors, whose sum is σ = 21483228518. Its totient is φ = 21483228516.

The previous prime is 21483228511. The next prime is 21483228527. The reversal of 21483228517 is 71582238412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19622686561 + 1860541956 = 140081^2 + 43134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21483228517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21483228511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10741614258 + 10741614259.

It is an arithmetic number, because the mean of its divisors is an integer number (10741614259).

Almost surely, 2^21483228517 is an apocalyptic number.

It is an amenable number.

21483228517 is a deficient number, since it is larger than the sum of its proper divisors (1).

21483228517 is an equidigital number, since it uses as much as digits as its factorization.

21483228517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 43.

It can be divided in two parts, 21483 and 228517, that added together give a square (250000 = 500²).

The spelling of 21483228517 in words is "twenty-one billion, four hundred eighty-three million, two hundred twenty-eight thousand, five hundred seventeen".