21221101010011 has 32 divisors (see below), whose sum is σ = 25043111520768. Its totient is φ = 17604816203520.

The previous prime is 21221101009993. The next prime is 21221101010027. The reversal of 21221101010011 is 11001010112212.

It is a happy number.

It is not a de Polignac number, because 21221101010011 - 2²³ = 21221092621403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221101009973 and 21221101010000.

It is not an unprimeable number, because it can be changed into a prime (21221101010071) 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, 26297311 + ... + 27092263.

It is an arithmetic number, because the mean of its divisors is an integer number (782597235024).

Almost surely, 2^{21221101010011} is an apocalyptic number.

21221101010011 is a deficient number, since it is larger than the sum of its proper divisors (3822010510757).

21221101010011 is a wasteful number, since it uses less digits than its factorization.

21221101010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795811.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21221101010011 its reverse (11001010112212), we get a palindrome (32222111122223).

The spelling of 21221101010011 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred one million, ten thousand, eleven".