21202100202121 has 8 divisors (see below), whose sum is σ = 21496070663424. Its totient is φ = 20909046966480.

The previous prime is 21202100202071. The next prime is 21202100202131. The reversal of 21202100202121 is 12120200120212.

It is a happy number.

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 21202100202121 - 2¹⁷ = 21202100071049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202100202095 and 21202100202104.

It is not an unprimeable number, because it can be changed into a prime (21202100202131) 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, 229259865 + ... + 229352326.

It is an arithmetic number, because the mean of its divisors is an integer number (2687008832928).

Almost surely, 2^{21202100202121} is an apocalyptic number.

It is an amenable number.

21202100202121 is a deficient number, since it is larger than the sum of its proper divisors (293970461303).

21202100202121 is an equidigital number, since it uses as much as digits as its factorization.

21202100202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458612831.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21202100202121 its reverse (12120200120212), we get a palindrome (33322300322333).

The spelling of 21202100202121 in words is "twenty-one trillion, two hundred two billion, one hundred million, two hundred two thousand, one hundred twenty-one".