21112120200021 has 8 divisors (see below), whose sum is σ = 28151046062880. Its totient is φ = 14073970568592.

The previous prime is 21112120199927. The next prime is 21112120200043. The reversal of 21112120200021 is 12000202121112.

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

It is not a de Polignac number, because 21112120200021 - 2³⁴ = 21094940330837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112120205021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193994391 + ... + 194103188.

It is an arithmetic number, because the mean of its divisors is an integer number (3518880757860).

Almost surely, 2^{21112120200021} is an apocalyptic number.

It is an amenable number.

21112120200021 is a deficient number, since it is larger than the sum of its proper divisors (7038925862859).

21112120200021 is a wasteful number, since it uses less digits than its factorization.

21112120200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388115715.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21112120200021 its reverse (12000202121112), we get a palindrome (33112322321133).

The spelling of 21112120200021 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty million, two hundred thousand, twenty-one".