21244884884 has 24 divisors (see below), whose sum is σ = 40089840000. Its totient is φ = 9817917120.

The previous prime is 21244884863. The next prime is 21244884893. The reversal of 21244884884 is 48848844212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3405884 + ... + 3412115.

It is an arithmetic number, because the mean of its divisors is an integer number (1670410000).

Almost surely, 2^21244884884 is an apocalyptic number.

It is an amenable number.

21244884884 is a deficient number, since it is larger than the sum of its proper divisors (18844955116).

21244884884 is a wasteful number, since it uses less digits than its factorization.

21244884884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6818063 (or 6818061 counting only the distinct ones).

The product of its digits is 4194304, while the sum is 53.

The spelling of 21244884884 in words is "twenty-one billion, two hundred forty-four million, eight hundred eighty-four thousand, eight hundred eighty-four".