21221222011011 has 96 divisors (see below), whose sum is σ = 34924482512640. Its totient is φ = 12724792692480.

The previous prime is 21221222011001. The next prime is 21221222011021. The reversal of 21221222011011 is 11011022212212.

21221222011011 is a `hidden beast` number, since 212 + 212 + 220 + 1 + 10 + 11 = 666.

It is an interprime number because it is at equal distance from previous prime (21221222011001) and next prime (21221222011021).

It is not a de Polignac number, because 21221222011011 - 2⁷ = 21221222010883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221222011001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 275072235 + ... + 275149371.

It is an arithmetic number, because the mean of its divisors is an integer number (363796692840).

Almost surely, 2^{21221222011011} is an apocalyptic number.

21221222011011 is a deficient number, since it is larger than the sum of its proper divisors (13703260501629).

21221222011011 is a wasteful number, since it uses less digits than its factorization.

21221222011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78062 (or 78045 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221222011011 its reverse (11011022212212), we get a palindrome (32232244223223).

The spelling of 21221222011011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, eleven thousand, eleven".