21718054634 has 8 divisors (see below), whose sum is σ = 33334688640. Its totient is φ = 10606491756.

The previous prime is 21718054619. The next prime is 21718054649. The reversal of 21718054634 is 43645081712.

It is an interprime number because it is at equal distance from previous prime (21718054619) and next prime (21718054649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21718054591 and 21718054600.

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, 126267674 + ... + 126267845.

It is an arithmetic number, because the mean of its divisors is an integer number (4166836080).

Almost surely, 2^21718054634 is an apocalyptic number.

21718054634 is a deficient number, since it is larger than the sum of its proper divisors (11616634006).

21718054634 is a wasteful number, since it uses less digits than its factorization.

21718054634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252535564.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 21718054634 in words is "twenty-one billion, seven hundred eighteen million, fifty-four thousand, six hundred thirty-four".