21616652767 has 2 divisors, whose sum is σ = 21616652768. Its totient is φ = 21616652766.

The previous prime is 21616652747. The next prime is 21616652839. The reversal of 21616652767 is 76725661612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21616652767 - 2⁷ = 21616652639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21616652767.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21616652737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808326383 + 10808326384.

It is an arithmetic number, because the mean of its divisors is an integer number (10808326384).

Almost surely, 2^21616652767 is an apocalyptic number.

21616652767 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616652767 is an equidigital number, since it uses as much as digits as its factorization.

21616652767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 49.

The spelling of 21616652767 in words is "twenty-one billion, six hundred sixteen million, six hundred fifty-two thousand, seven hundred sixty-seven".