21910865124 has 12 divisors (see below), whose sum is σ = 51125351984. Its totient is φ = 7303621704.

The previous prime is 21910865083. The next prime is 21910865143. The reversal of 21910865124 is 42156801912.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912952702 + ... + 912952725.

Almost surely, 2^21910865124 is an apocalyptic number.

It is an amenable number.

21910865124 is an abundant number, since it is smaller than the sum of its proper divisors (29214486860).

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

21910865124 is a wasteful number, since it uses less digits than its factorization.

21910865124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825905434 (or 1825905432 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 21910865124 in words is "twenty-one billion, nine hundred ten million, eight hundred sixty-five thousand, one hundred twenty-four".