21189233814 has 32 divisors (see below), whose sum is σ = 49463018496. Its totient is φ = 5925256320.

The previous prime is 21189233777. The next prime is 21189233839. The reversal of 21189233814 is 41833298112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5365107 + ... + 5369054.

It is an arithmetic number, because the mean of its divisors is an integer number (1545719328).

Almost surely, 2^21189233814 is an apocalyptic number.

21189233814 is an abundant number, since it is smaller than the sum of its proper divisors (28273784682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21189233814 is a wasteful number, since it uses less digits than its factorization.

21189233814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10734220.

The product of its digits is 82944, while the sum is 42.

The spelling of 21189233814 in words is "twenty-one billion, one hundred eighty-nine million, two hundred thirty-three thousand, eight hundred fourteen".