21616480427 has 4 divisors (see below), whose sum is σ = 21644445600. Its totient is φ = 21588515256.

The previous prime is 21616480423. The next prime is 21616480429. The reversal of 21616480427 is 72408461612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21616480427 - 2² = 21616480423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616480423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13981427 + ... + 13982972.

It is an arithmetic number, because the mean of its divisors is an integer number (5411111400).

Almost surely, 2^21616480427 is an apocalyptic number.

21616480427 is a deficient number, since it is larger than the sum of its proper divisors (27965173).

21616480427 is an equidigital number, since it uses as much as digits as its factorization.

21616480427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27965172.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 21616480427 in words is "twenty-one billion, six hundred sixteen million, four hundred eighty thousand, four hundred twenty-seven".