21220212220011 has 24 divisors (see below), whose sum is σ = 35088478172384. Its totient is φ = 12105659433600.

The previous prime is 21220212219979. The next prime is 21220212220013. The reversal of 21220212220011 is 11002221202212.

It is a happy number.

21220212220011 is a `hidden beast` number, since 2 + 1 + 220 + 212 + 220 + 0 + 11 = 666.

It is not a de Polignac number, because 21220212220011 - 2⁵ = 21220212219979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220212220013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 280185736 + ... + 280261461.

Almost surely, 2^{21220212220011} is an apocalyptic number.

21220212220011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21220212220011 is a deficient number, since it is larger than the sum of its proper divisors (13868265952373).

21220212220011 is a wasteful number, since it uses less digits than its factorization.

21220212220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560447811 (or 560447808 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21220212220011 its reverse (11002221202212), we get a palindrome (32222433422223).

The spelling of 21220212220011 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty thousand, eleven".