21120102000021 has 8 divisors (see below), whose sum is σ = 28160279730720. Its totient is φ = 14079996134672.

The previous prime is 21120101999999. The next prime is 21120102000037. The reversal of 21120102000021 is 12000020102112.

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 21120102000021 - 2¹⁰ = 21120101998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120101999970 and 21120102000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120102000061) 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, 17276826 + ... + 18458843.

It is an arithmetic number, because the mean of its divisors is an integer number (3520034966340).

Almost surely, 2^{21120102000021} is an apocalyptic number.

It is an amenable number.

21120102000021 is a deficient number, since it is larger than the sum of its proper divisors (7040177730699).

21120102000021 is a wasteful number, since it uses less digits than its factorization.

21120102000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35932675.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120102000021 its reverse (12000020102112), we get a palindrome (33120122102133).

The spelling of 21120102000021 in words is "twenty-one trillion, one hundred twenty billion, one hundred two million, twenty-one", and thus it is an aban number.