21110021211 has 32 divisors (see below), whose sum is σ = 29220512832. Its totient is φ = 13548953600.

The previous prime is 21110021173. The next prime is 21110021221. The reversal of 21110021211 is 11212001112.

It is a cyclic number.

It is not a de Polignac number, because 21110021211 - 2³⁰ = 20036279387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1808851 + ... + 1820483.

It is an arithmetic number, because the mean of its divisors is an integer number (913141026).

Almost surely, 2^21110021211 is an apocalyptic number.

21110021211 is a deficient number, since it is larger than the sum of its proper divisors (8110491621).

21110021211 is a wasteful number, since it uses less digits than its factorization.

21110021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11903.

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

Adding to 21110021211 its reverse (11212001112), we get a palindrome (32322022323).

The spelling of 21110021211 in words is "twenty-one billion, one hundred ten million, twenty-one thousand, two hundred eleven".