21184150871 has 8 divisors (see below), whose sum is σ = 24014422320. Its totient is φ = 18525411072.

The previous prime is 21184150849. The next prime is 21184150877. The reversal of 21184150871 is 17805148112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21184150871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21184150877) 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, 42882650 + ... + 42883143.

It is an arithmetic number, because the mean of its divisors is an integer number (3001802790).

Almost surely, 2^21184150871 is an apocalyptic number.

21184150871 is a deficient number, since it is larger than the sum of its proper divisors (2830271449).

21184150871 is a wasteful number, since it uses less digits than its factorization.

21184150871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85765825.

The product of its (nonzero) digits is 17920, while the sum is 38.

Adding to 21184150871 its reverse (17805148112), we get a palindrome (38989298983).

The spelling of 21184150871 in words is "twenty-one billion, one hundred eighty-four million, one hundred fifty thousand, eight hundred seventy-one".