21212220012011 has 32 divisors (see below), whose sum is σ = 24705341107200. Its totient is φ = 17837427202560.

The previous prime is 21212220011921. The next prime is 21212220012031. The reversal of 21212220012011 is 11021002221212.

It is not a de Polignac number, because 21212220012011 - 2¹⁴ = 21212219995627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212220012031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 182791775 + ... + 182907783.

It is an arithmetic number, because the mean of its divisors is an integer number (772041909600).

Almost surely, 2^{21212220012011} is an apocalyptic number.

21212220012011 is a deficient number, since it is larger than the sum of its proper divisors (3493121095189).

21212220012011 is a wasteful number, since it uses less digits than its factorization.

21212220012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117899.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212220012011 its reverse (11021002221212), we get a palindrome (32233222233223).

The spelling of 21212220012011 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, twelve thousand, eleven".