21110121011211 has 16 divisors (see below), whose sum is σ = 28162957404960. Its totient is φ = 14065350264320.

The previous prime is 21110121011209. The next prime is 21110121011233. The reversal of 21110121011211 is 11211012101112.

It is a cyclic number.

It is not a de Polignac number, because 21110121011211 - 2¹ = 21110121011209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110121011251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95949571 + ... + 96169331.

It is an arithmetic number, because the mean of its divisors is an integer number (1760184837810).

Almost surely, 2^{21110121011211} is an apocalyptic number.

21110121011211 is a deficient number, since it is larger than the sum of its proper divisors (7052836393749).

21110121011211 is a wasteful number, since it uses less digits than its factorization.

21110121011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237966.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110121011211 its reverse (11211012101112), we get a palindrome (32321133112323).

The spelling of 21110121011211 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, eleven thousand, two hundred eleven".