21560522443 has 2 divisors, whose sum is σ = 21560522444. Its totient is φ = 21560522442.

The previous prime is 21560522341. The next prime is 21560522453. The reversal of 21560522443 is 34422506512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21560522443 - 2¹³ = 21560514251 is a prime.

It is a super-2 number, since 2×21560522443² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21560522399 and 21560522408.

It is not a weakly prime, because it can be changed into another prime (21560522453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10780261221 + 10780261222.

It is an arithmetic number, because the mean of its divisors is an integer number (10780261222).

Almost surely, 2^21560522443 is an apocalyptic number.

21560522443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21560522443 is an equidigital number, since it uses as much as digits as its factorization.

21560522443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 34.

The spelling of 21560522443 in words is "twenty-one billion, five hundred sixty million, five hundred twenty-two thousand, four hundred forty-three".