21111012222011 has 4 divisors (see below), whose sum is σ = 21277240664832. Its totient is φ = 20944783779192.

The previous prime is 21111012221993. The next prime is 21111012222061. The reversal of 21111012222011 is 11022221011112.

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 21111012222011 - 2³⁰ = 21109938480187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111012222061) 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, 83114221220 + ... + 83114221473.

It is an arithmetic number, because the mean of its divisors is an integer number (5319310166208).

Almost surely, 2^{21111012222011} is an apocalyptic number.

21111012222011 is a deficient number, since it is larger than the sum of its proper divisors (166228442821).

21111012222011 is a wasteful number, since it uses less digits than its factorization.

21111012222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166228442820.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111012222011 its reverse (11022221011112), we get a palindrome (32133233233123).

The spelling of 21111012222011 in words is "twenty-one trillion, one hundred eleven billion, twelve million, two hundred twenty-two thousand, eleven".