21200021102121 has 8 divisors (see below), whose sum is σ = 28312359901920. Its totient is φ = 14110514851872.

The previous prime is 21200021102107. The next prime is 21200021102129. The reversal of 21200021102121 is 12120112000212.

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

It is a de Polignac number, because none of the positive numbers 2^k-21200021102121 is a prime.

It is a super-3 number, since 3×21200021102121³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21200021102121.

It is not an unprimeable number, because it can be changed into a prime (21200021102129) 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, 5708135220 + ... + 5708138933.

It is an arithmetic number, because the mean of its divisors is an integer number (3539044987740).

Almost surely, 2^{21200021102121} is an apocalyptic number.

It is an amenable number.

21200021102121 is a deficient number, since it is larger than the sum of its proper divisors (7112338799799).

21200021102121 is a wasteful number, since it uses less digits than its factorization.

21200021102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11416274775.

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

Adding to 21200021102121 its reverse (12120112000212), we get a palindrome (33320133102333).

The spelling of 21200021102121 in words is "twenty-one trillion, two hundred billion, twenty-one million, one hundred two thousand, one hundred twenty-one".