21111001222011 has 4 divisors (see below), whose sum is σ = 28148001629352. Its totient is φ = 14074000814672.

The previous prime is 21111001222007. The next prime is 21111001222019. The reversal of 21111001222011 is 11022210011112.

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 21111001222011 - 2² = 21111001222007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111001222019) 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, 3518500203666 + ... + 3518500203671.

It is an arithmetic number, because the mean of its divisors is an integer number (7037000407338).

Almost surely, 2^{21111001222011} is an apocalyptic number.

21111001222011 is a deficient number, since it is larger than the sum of its proper divisors (7037000407341).

21111001222011 is an equidigital number, since it uses as much as digits as its factorization.

21111001222011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7037000407340.

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

Adding to 21111001222011 its reverse (11022210011112), we get a palindrome (32133211233123).

The spelling of 21111001222011 in words is "twenty-one trillion, one hundred eleven billion, one million, two hundred twenty-two thousand, eleven".