21819011914 has 16 divisors (see below), whose sum is σ = 38610602496. Its totient is φ = 9049359600.

The previous prime is 21819011911. The next prime is 21819011941. The reversal of 21819011914 is 41911091812.

It is not an unprimeable number, because it can be changed into a prime (21819011911) 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, 25136677 + ... + 25137544.

It is an arithmetic number, because the mean of its divisors is an integer number (2413162656).

Almost surely, 2^21819011914 is an apocalyptic number.

21819011914 is a deficient number, since it is larger than the sum of its proper divisors (16791590582).

21819011914 is a wasteful number, since it uses less digits than its factorization.

21819011914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50274261.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 21819011914 in words is "twenty-one billion, eight hundred nineteen million, eleven thousand, nine hundred fourteen".