21841372887 has 8 divisors (see below), whose sum is σ = 29123166336. Its totient is φ = 14560247352.

The previous prime is 21841372877. The next prime is 21841372909. The reversal of 21841372887 is 78827314812.

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

It is not a de Polignac number, because 21841372887 - 2⁷ = 21841372759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841372877) 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, 84913 + ... + 225594.

It is an arithmetic number, because the mean of its divisors is an integer number (3640395792).

Almost surely, 2^21841372887 is an apocalyptic number.

21841372887 is a deficient number, since it is larger than the sum of its proper divisors (7281793449).

21841372887 is a wasteful number, since it uses less digits than its factorization.

21841372887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333957.

The product of its digits is 1204224, while the sum is 51.

The spelling of 21841372887 in words is "twenty-one billion, eight hundred forty-one million, three hundred seventy-two thousand, eight hundred eighty-seven".