21000222024 has 32 divisors (see below), whose sum is σ = 52671585120. Its totient is φ = 6977270016.

The previous prime is 21000222007. The next prime is 21000222071. The reversal of 21000222024 is 42022200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000221994 and 21000222012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1417729 + ... + 1432464.

It is an arithmetic number, because the mean of its divisors is an integer number (1645987035).

Almost surely, 2^21000222024 is an apocalyptic number.

21000222024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21000222024 is an abundant number, since it is smaller than the sum of its proper divisors (31671363096).

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

21000222024 is a wasteful number, since it uses less digits than its factorization.

21000222024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850509 (or 2850505 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21000222024 its reverse (42022200012), we get a palindrome (63022422036).

The spelling of 21000222024 in words is "twenty-one billion, two hundred twenty-two thousand, twenty-four".