21112000021 has 8 divisors (see below), whose sum is σ = 24523541504. Its totient is φ = 17799343920.

The previous prime is 21111999947. The next prime is 21112000097. The reversal of 21112000021 is 12000021112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112000021 - 2¹⁹ = 21111475733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21111999971 and 21112000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112003021) by changing a digit.

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, 24720885 + ... + 24721738.

It is an arithmetic number, because the mean of its divisors is an integer number (3065442688).

Almost surely, 2^21112000021 is an apocalyptic number.

It is an amenable number.

21112000021 is a deficient number, since it is larger than the sum of its proper divisors (3411541483).

21112000021 is an equidigital number, since it uses as much as digits as its factorization.

21112000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49442691.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21112000021 its reverse (12000021112), we get a palindrome (33112021133).

The spelling of 21112000021 in words is "twenty-one billion, one hundred twelve million, twenty-one", and thus it is an aban number.