21116242844 has 24 divisors (see below), whose sum is σ = 40389326208. Its totient is φ = 9616504320.

The previous prime is 21116242843. The next prime is 21116242853. The reversal of 21116242844 is 44824261112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116242843) 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, 5006489 + ... + 5010704.

It is an arithmetic number, because the mean of its divisors is an integer number (1682888592).

Almost surely, 2^21116242844 is an apocalyptic number.

It is an amenable number.

21116242844 is a deficient number, since it is larger than the sum of its proper divisors (19273083364).

21116242844 is a wasteful number, since it uses less digits than its factorization.

21116242844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10017245 (or 10017243 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The spelling of 21116242844 in words is "twenty-one billion, one hundred sixteen million, two hundred forty-two thousand, eight hundred forty-four".