21121001000211 has 12 divisors (see below), whose sum is σ = 32759103592392. Its totient is φ = 12069143428608.

The previous prime is 21121001000173. The next prime is 21121001000221. The reversal of 21121001000211 is 11200010012112.

It is not a de Polignac number, because 21121001000211 - 2⁶ = 21121001000147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21121001000221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71840139310 + ... + 71840139603.

It is an arithmetic number, because the mean of its divisors is an integer number (2729925299366).

Almost surely, 2^{21121001000211} is an apocalyptic number.

21121001000211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21121001000211 is a deficient number, since it is larger than the sum of its proper divisors (11638102592181).

21121001000211 is a wasteful number, since it uses less digits than its factorization.

21121001000211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143680278930 (or 143680278923 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21121001000211 its reverse (11200010012112), we get a palindrome (32321011012323).

The spelling of 21121001000211 in words is "twenty-one trillion, one hundred twenty-one billion, one million, two hundred eleven", and thus it is an aban number.