21760480240087 has 4 divisors (see below), whose sum is σ = 21760497105040. Its totient is φ = 21760463375136.

The previous prime is 21760480240073. The next prime is 21760480240099. The reversal of 21760480240087 is 78004208406712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21760480240087 - 2³⁵ = 21726120501719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21760480240087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760480210087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6320787 + ... + 9136372.

It is an arithmetic number, because the mean of its divisors is an integer number (5440124276260).

Almost surely, 2^{21760480240087} is an apocalyptic number.

21760480240087 is a deficient number, since it is larger than the sum of its proper divisors (16864953).

21760480240087 is a wasteful number, since it uses less digits than its factorization.

21760480240087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16864952.

The product of its (nonzero) digits is 1204224, while the sum is 49.

Adding to 21760480240087 its reverse (78004208406712), we get a palindrome (99764688646799).

The spelling of 21760480240087 in words is "twenty-one trillion, seven hundred sixty billion, four hundred eighty million, two hundred forty thousand, eighty-seven".