21100200012121 has 4 divisors (see below), whose sum is σ = 22017600012672. Its totient is φ = 20182800011572.

The previous prime is 21100200012103. The next prime is 21100200012191. The reversal of 21100200012121 is 12121000200112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100200012121 - 2²³ = 21100191623513 is a prime.

It is a super-2 number, since 2×21100200012121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100200012191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458700000241 + ... + 458700000286.

It is an arithmetic number, because the mean of its divisors is an integer number (5504400003168).

Almost surely, 2^{21100200012121} is an apocalyptic number.

It is an amenable number.

21100200012121 is a deficient number, since it is larger than the sum of its proper divisors (917400000551).

21100200012121 is an equidigital number, since it uses as much as digits as its factorization.

21100200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917400000550.

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

Adding to 21100200012121 its reverse (12121000200112), we get a palindrome (33221200212233).

The spelling of 21100200012121 in words is "twenty-one trillion, one hundred billion, two hundred million, twelve thousand, one hundred twenty-one".