21716650547 has 2 divisors, whose sum is σ = 21716650548. Its totient is φ = 21716650546.

The previous prime is 21716650513. The next prime is 21716650559. The reversal of 21716650547 is 74505661712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21716650547 is a prime.

It is a super-2 number, since 2×21716650547² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21716650498 and 21716650507.

It is not a weakly prime, because it can be changed into another prime (21716650247) 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, 10858325273 + 10858325274.

It is an arithmetic number, because the mean of its divisors is an integer number (10858325274).

Almost surely, 2^21716650547 is an apocalyptic number.

21716650547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21716650547 is an equidigital number, since it uses as much as digits as its factorization.

21716650547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 21716650547 in words is "twenty-one billion, seven hundred sixteen million, six hundred fifty thousand, five hundred forty-seven".