21110020024 has 8 divisors (see below), whose sum is σ = 39581287560. Its totient is φ = 10555010008.

The previous prime is 21110020013. The next prime is 21110020037. The reversal of 21110020024 is 42002001112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21110019986 and 21110020013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319376244 + ... + 1319376259.

It is an arithmetic number, because the mean of its divisors is an integer number (4947660945).

Almost surely, 2^21110020024 is an apocalyptic number.

It is an amenable number.

21110020024 is a deficient number, since it is larger than the sum of its proper divisors (18471267536).

21110020024 is a wasteful number, since it uses less digits than its factorization.

21110020024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638752509 (or 2638752505 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21110020024 its reverse (42002001112), we get a palindrome (63112021136).

The spelling of 21110020024 in words is "twenty-one billion, one hundred ten million, twenty thousand, twenty-four".