21110212212211 has 4 divisors (see below), whose sum is σ = 21110366502432. Its totient is φ = 21110057921992.

The previous prime is 21110212212209. The next prime is 21110212212277. The reversal of 21110212212211 is 11221221201112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21110212212211 - 2¹ = 21110212212209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110212218211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76939696 + ... + 77213581.

It is an arithmetic number, because the mean of its divisors is an integer number (5277591625608).

Almost surely, 2^{21110212212211} is an apocalyptic number.

21110212212211 is a deficient number, since it is larger than the sum of its proper divisors (154290221).

21110212212211 is a wasteful number, since it uses less digits than its factorization.

21110212212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154290220.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21110212212211 its reverse (11221221201112), we get a palindrome (32331433413323).

The spelling of 21110212212211 in words is "twenty-one trillion, one hundred ten billion, two hundred twelve million, two hundred twelve thousand, two hundred eleven".