21112221111011 has 8 divisors (see below), whose sum is σ = 21378943776960. Its totient is φ = 20846783856168.

The previous prime is 21112221110999. The next prime is 21112221111013. The reversal of 21112221111011 is 11011112221112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21112221111011 - 2³⁰ = 21111147369187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112221111013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321319721 + ... + 321385418.

It is an arithmetic number, because the mean of its divisors is an integer number (2672367972120).

Almost surely, 2^{21112221111011} is an apocalyptic number.

21112221111011 is a deficient number, since it is larger than the sum of its proper divisors (266722665949).

21112221111011 is a wasteful number, since it uses less digits than its factorization.

21112221111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642705553.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21112221111011 its reverse (11011112221112), we get a palindrome (32123333332123).

The spelling of 21112221111011 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-one million, one hundred eleven thousand, eleven".