21713316424 has 8 divisors (see below), whose sum is σ = 40712468310. Its totient is φ = 10856658208.

The previous prime is 21713316407. The next prime is 21713316439. The reversal of 21713316424 is 42461331712.

It can be written as a sum of positive squares in only one way, i.e., 13616556100 + 8096760324 = 116690^2 + 89982^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21713316424² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21713316424.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1357082269 + ... + 1357082284.

Almost surely, 2^21713316424 is an apocalyptic number.

It is an amenable number.

21713316424 is a deficient number, since it is larger than the sum of its proper divisors (18999151886).

21713316424 is a wasteful number, since it uses less digits than its factorization.

21713316424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714164559 (or 2714164555 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The spelling of 21713316424 in words is "twenty-one billion, seven hundred thirteen million, three hundred sixteen thousand, four hundred twenty-four".