21708732454 has 32 divisors (see below), whose sum is σ = 36306770400. Its totient is φ = 9674588160.

The previous prime is 21708732433. The next prime is 21708732457. The reversal of 21708732454 is 45423780712.

It is a self number, because there is not a number n which added to its sum of digits gives 21708732454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21708732457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2507974 + ... + 2516614.

It is an arithmetic number, because the mean of its divisors is an integer number (1134586575).

Almost surely, 2^21708732454 is an apocalyptic number.

21708732454 is a deficient number, since it is larger than the sum of its proper divisors (14598037946).

21708732454 is a wasteful number, since it uses less digits than its factorization.

21708732454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12568.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 21708732454 in words is "twenty-one billion, seven hundred eight million, seven hundred thirty-two thousand, four hundred fifty-four".