21884539685 has 8 divisors (see below), whose sum is σ = 26276824440. Its totient is φ = 17497380544.

The previous prime is 21884539657. The next prime is 21884539687. The reversal of 21884539685 is 58693548812.

It can be written as a sum of positive squares in 4 ways, for example, as 311099044 + 21573440641 = 17638^2 + 146879^2 .

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 21884539685 - 2⁸ = 21884539429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884539687) 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, 1272002 + ... + 1289091.

It is an arithmetic number, because the mean of its divisors is an integer number (3284603055).

Almost surely, 2^21884539685 is an apocalyptic number.

It is an amenable number.

21884539685 is a deficient number, since it is larger than the sum of its proper divisors (4392284755).

21884539685 is a wasteful number, since it uses less digits than its factorization.

21884539685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562807.

The product of its digits is 16588800, while the sum is 59.

The spelling of 21884539685 in words is "twenty-one billion, eight hundred eighty-four million, five hundred thirty-nine thousand, six hundred eighty-five".