21436160465 has 16 divisors (see below), whose sum is σ = 25998123648. Its totient is φ = 16965904896.

The previous prime is 21436160453. The next prime is 21436160483. The reversal of 21436160465 is 56406163412.

It is a cyclic number.

It is not a de Polignac number, because 21436160465 - 2²⁰ = 21435111889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673174 + ... + 1685936.

It is an arithmetic number, because the mean of its divisors is an integer number (1624882728).

Almost surely, 2^21436160465 is an apocalyptic number.

It is an amenable number.

21436160465 is a deficient number, since it is larger than the sum of its proper divisors (4561963183).

21436160465 is a wasteful number, since it uses less digits than its factorization.

21436160465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16328.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 21436160465 in words is "twenty-one billion, four hundred thirty-six million, one hundred sixty thousand, four hundred sixty-five".