21221012021011 has 32 divisors (see below), whose sum is σ = 23598827271360. Its totient is φ = 18921627648000.

The previous prime is 21221012020919. The next prime is 21221012021029. The reversal of 21221012021011 is 11012021012212.

It is not a de Polignac number, because 21221012021011 - 2²⁹ = 21220475150099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221012022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 685041555 + ... + 685072531.

It is an arithmetic number, because the mean of its divisors is an integer number (737463352230).

Almost surely, 2^{21221012021011} is an apocalyptic number.

21221012021011 is a deficient number, since it is larger than the sum of its proper divisors (2377815250349).

21221012021011 is a wasteful number, since it uses less digits than its factorization.

21221012021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36855.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221012021011 its reverse (11012021012212), we get a palindrome (32233033033223).

It can be divided in two parts, 212210 and 12021011, that added together give a palindrome (12233221).

The spelling of 21221012021011 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, twenty-one thousand, eleven".