21121011000211 has 8 divisors (see below), whose sum is σ = 21128261117904. Its totient is φ = 21113761298400.

The previous prime is 21121011000197. The next prime is 21121011000227. The reversal of 21121011000211 is 11200011012112.

It is a happy number.

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 21121011000211 - 2¹⁵ = 21121010967443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121011000191 and 21121011000200.

It is not an unprimeable number, because it can be changed into a prime (21121011000911) 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, 128156161 + ... + 128320861.

It is an arithmetic number, because the mean of its divisors is an integer number (2641032639738).

Almost surely, 2^{21121011000211} is an apocalyptic number.

21121011000211 is a deficient number, since it is larger than the sum of its proper divisors (7250117693).

21121011000211 is a wasteful number, since it uses less digits than its factorization.

21121011000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207941.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21121011000211 its reverse (11200011012112), we get a palindrome (32321022012323).

The spelling of 21121011000211 in words is "twenty-one trillion, one hundred twenty-one billion, eleven million, two hundred eleven", and thus it is an aban number.