21542667005 has 8 divisors (see below), whose sum is σ = 25995621600. Its totient is φ = 17137852816.

The previous prime is 21542666993. The next prime is 21542667017. The reversal of 21542667005 is 50076624512.

It is an interprime number because it is at equal distance from previous prime (21542666993) and next prime (21542667017).

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

It is a cyclic number.

It is not a de Polignac number, because 21542667005 - 2⁸ = 21542666749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21542667005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12034115 + ... + 12035904.

It is an arithmetic number, because the mean of its divisors is an integer number (3249452700).

Almost surely, 2^21542667005 is an apocalyptic number.

It is an amenable number.

21542667005 is a deficient number, since it is larger than the sum of its proper divisors (4452954595).

21542667005 is a wasteful number, since it uses less digits than its factorization.

21542667005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24070203.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21542667005 in words is "twenty-one billion, five hundred forty-two million, six hundred sixty-seven thousand, five".