21221222020011 has 96 divisors (see below), whose sum is σ = 35172824948352. Its totient is φ = 12230361538560.

The previous prime is 21221222019929. The next prime is 21221222020013. The reversal of 21221222020011 is 11002022212212.

It is a happy number.

21221222020011 is a `hidden beast` number, since 21 + 2 + 212 + 220 + 200 + 11 = 666.

It is not a de Polignac number, because 21221222020011 - 2⁷ = 21221222019883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221222020013) 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, 26518431 + ... + 27306951.

It is an arithmetic number, because the mean of its divisors is an integer number (366383593212).

Almost surely, 2^{21221222020011} is an apocalyptic number.

21221222020011 is a deficient number, since it is larger than the sum of its proper divisors (13951602928341).

21221222020011 is a wasteful number, since it uses less digits than its factorization.

21221222020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788773 (or 788770 counting only the distinct ones).

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

Adding to 21221222020011 its reverse (11002022212212), we get a palindrome (32223244232223).

The spelling of 21221222020011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty thousand, eleven".