21887331841 has 8 divisors (see below), whose sum is σ = 22052673440. Its totient is φ = 21722103072.

The previous prime is 21887331811. The next prime is 21887331847. The reversal of 21887331841 is 14813378812.

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 21887331841 - 2¹⁵ = 21887299073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21887331791 and 21887331800.

It is not an unprimeable number, because it can be changed into a prime (21887331847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383806 + ... + 437128.

It is an arithmetic number, because the mean of its divisors is an integer number (2756584180).

Almost surely, 2^21887331841 is an apocalyptic number.

It is an amenable number.

21887331841 is a deficient number, since it is larger than the sum of its proper divisors (165341599).

21887331841 is a wasteful number, since it uses less digits than its factorization.

21887331841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56415.

The product of its digits is 258048, while the sum is 46.

The spelling of 21887331841 in words is "twenty-one billion, eight hundred eighty-seven million, three hundred thirty-one thousand, eight hundred forty-one".