21986216087 has 8 divisors (see below), whose sum is σ = 24758671872. Its totient is φ = 19342711800.

The previous prime is 21986216047. The next prime is 21986216123. The reversal of 21986216087 is 78061268912.

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 21986216087 - 2⁸ = 21986215831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21986216047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32237513 + ... + 32238194.

It is an arithmetic number, because the mean of its divisors is an integer number (3094833984).

Almost surely, 2^21986216087 is an apocalyptic number.

21986216087 is a deficient number, since it is larger than the sum of its proper divisors (2772455785).

21986216087 is a wasteful number, since it uses less digits than its factorization.

21986216087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64475749.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 21986216087 in words is "twenty-one billion, nine hundred eighty-six million, two hundred sixteen thousand, eighty-seven".