21011110022211 has 16 divisors (see below), whose sum is σ = 28125015473568. Its totient is φ = 13952342880000.

The previous prime is 21011110022179. The next prime is 21011110022263. The reversal of 21011110022211 is 11222001111012.

It is a happy number.

It is not a de Polignac number, because 21011110022211 - 2⁵ = 21011110022179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011111022211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2398540 + ... + 6911961.

It is an arithmetic number, because the mean of its divisors is an integer number (1757813467098).

Almost surely, 2^{21011110022211} is an apocalyptic number.

21011110022211 is a deficient number, since it is larger than the sum of its proper divisors (7113905451357).

21011110022211 is a wasteful number, since it uses less digits than its factorization.

21011110022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9313462.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011110022211 its reverse (11222001111012), we get a palindrome (32233111133223).

The spelling of 21011110022211 in words is "twenty-one trillion, eleven billion, one hundred ten million, twenty-two thousand, two hundred eleven".