21210100200121 has 8 divisors (see below), whose sum is σ = 24249237649920. Its totient is φ = 18173243534208.

The previous prime is 21210100200103. The next prime is 21210100200143. The reversal of 21210100200121 is 12100200101212.

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-21210100200121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210100200521) 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, 570176041 + ... + 570213238.

It is an arithmetic number, because the mean of its divisors is an integer number (3031154706240).

Almost surely, 2^{21210100200121} is an apocalyptic number.

It is an amenable number.

21210100200121 is a deficient number, since it is larger than the sum of its proper divisors (3039137449799).

21210100200121 is a wasteful number, since it uses less digits than its factorization.

21210100200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140391943.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210100200121 its reverse (12100200101212), we get a palindrome (33310300301333).

The spelling of 21210100200121 in words is "twenty-one trillion, two hundred ten billion, one hundred million, two hundred thousand, one hundred twenty-one".