21436635706424 has 16 divisors (see below), whose sum is σ = 40245688975320. Its totient is φ = 10704451979680.

The previous prime is 21436635706373. The next prime is 21436635706441. The reversal of 21436635706424 is 42460753663412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733227622 + ... + 1733239989.

Almost surely, 2^{21436635706424} is an apocalyptic number.

It is an amenable number.

21436635706424 is a deficient number, since it is larger than the sum of its proper divisors (18809053268896).

21436635706424 is a wasteful number, since it uses less digits than its factorization.

21436635706424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3466468390 (or 3466468386 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 53.

The spelling of 21436635706424 in words is "twenty-one trillion, four hundred thirty-six billion, six hundred thirty-five million, seven hundred six thousand, four hundred twenty-four".