21683833887 has 16 divisors (see below), whose sum is σ = 29336519520. Its totient is φ = 14244628992.

The previous prime is 21683833859. The next prime is 21683833889. The reversal of 21683833887 is 78833838612.

It is not a de Polignac number, because 21683833887 - 2¹¹ = 21683831839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21683833889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60358 + ... + 216819.

It is an arithmetic number, because the mean of its divisors is an integer number (1833532470).

Almost surely, 2^21683833887 is an apocalyptic number.

21683833887 is a deficient number, since it is larger than the sum of its proper divisors (7652685633).

21683833887 is a wasteful number, since it uses less digits than its factorization.

21683833887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277562.

The product of its digits is 9289728, while the sum is 57.

The spelling of 21683833887 in words is "twenty-one billion, six hundred eighty-three million, eight hundred thirty-three thousand, eight hundred eighty-seven".