21616480423 has 2 divisors, whose sum is σ = 21616480424. Its totient is φ = 21616480422.

The previous prime is 21616480411. The next prime is 21616480429. The reversal of 21616480423 is 32408461612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21616480423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21616480429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808240211 + 10808240212.

It is an arithmetic number, because the mean of its divisors is an integer number (10808240212).

Almost surely, 2^21616480423 is an apocalyptic number.

21616480423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616480423 is an equidigital number, since it uses as much as digits as its factorization.

21616480423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 21616480423 in words is "twenty-one billion, six hundred sixteen million, four hundred eighty thousand, four hundred twenty-three".