21113011522211 has 4 divisors (see below), whose sum is σ = 24129156025392. Its totient is φ = 18096867019032.

The previous prime is 21113011522171. The next prime is 21113011522241. The reversal of 21113011522211 is 11222511031112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113011522211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113011522241) 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, 1508072251580 + ... + 1508072251593.

It is an arithmetic number, because the mean of its divisors is an integer number (6032289006348).

Almost surely, 2^{21113011522211} is an apocalyptic number.

21113011522211 is a deficient number, since it is larger than the sum of its proper divisors (3016144503181).

21113011522211 is an equidigital number, since it uses as much as digits as its factorization.

21113011522211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016144503180.

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 21113011522211 its reverse (11222511031112), we get a palindrome (32335522553323).

The spelling of 21113011522211 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, five hundred twenty-two thousand, two hundred eleven".