21211021000121 has 8 divisors (see below), whose sum is σ = 21219565164864. Its totient is φ = 21202478565840.

The previous prime is 21211021000093. The next prime is 21211021000139. The reversal of 21211021000121 is 12100012011212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211021000121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21211021000096 and 21211021000105.

It is not an unprimeable number, because it can be changed into a prime (21211021000151) 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, 24372716 + ... + 25227986.

It is an arithmetic number, because the mean of its divisors is an integer number (2652445645608).

Almost surely, 2^{21211021000121} is an apocalyptic number.

It is an amenable number.

21211021000121 is a deficient number, since it is larger than the sum of its proper divisors (8544164743).

21211021000121 is an equidigital number, since it uses as much as digits as its factorization.

21211021000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865231.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21211021000121 its reverse (12100012011212), we get a palindrome (33311033011333).

The spelling of 21211021000121 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.