21121000211 has 8 divisors (see below), whose sum is σ = 22041845280. Its totient is φ = 20200366912.

The previous prime is 21121000177. The next prime is 21121000213. The reversal of 21121000211 is 11200012112.

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 21121000211 - 2²⁶ = 21053891347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121000192 and 21121000201.

It is not an unprimeable number, because it can be changed into a prime (21121000213) 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, 171095 + ... + 267423.

It is an arithmetic number, because the mean of its divisors is an integer number (2755230660).

Almost surely, 2^21121000211 is an apocalyptic number.

21121000211 is a deficient number, since it is larger than the sum of its proper divisors (920845069).

21121000211 is an equidigital number, since it uses as much as digits as its factorization.

21121000211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105885.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121000211 its reverse (11200012112), we get a palindrome (32321012323).

The spelling of 21121000211 in words is "twenty-one billion, one hundred twenty-one million, two hundred eleven", and thus it is an aban number.