21436516708 has 6 divisors (see below), whose sum is σ = 37513904246.
Its totient is φ = 10718258352.
The previous prime is 21436516697. The next prime is 21436516753. The reversal of 21436516708 is 80761563412.
It can be written as a sum of positive squares in only one way, i.e., 11668752484 + 9767764224 = 108022^2 + 98832^2
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679564585 + ... + 2679564592.
Almost surely, 221436516708 is an apocalyptic number.
It is an amenable number.
21436516708 is a deficient number, since it is larger than the sum of its proper divisors (16077387538).
21436516708 is a wasteful number, since it uses less digits than its factorization.
21436516708 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5359129181 (or 5359129179 counting only the distinct ones).
The product of its (nonzero) digits is 241920, while the sum is 43.
The spelling of 21436516708 in words is "twenty-one billion, four hundred thirty-six million, five hundred sixteen thousand, seven hundred eight".