21221222102011 has 4 divisors (see below), whose sum is σ = 21520112554224. Its totient is φ = 20922331649800.

The previous prime is 21221222101979. The next prime is 21221222102023. The reversal of 21221222102011 is 11020122212212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21221222102011 - 2⁵ = 21221222101979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21221222102011.

It is not an unprimeable number, because it can be changed into a prime (21221222105011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149445226000 + ... + 149445226141.

It is an arithmetic number, because the mean of its divisors is an integer number (5380028138556).

Almost surely, 2^{21221222102011} is an apocalyptic number.

21221222102011 is a deficient number, since it is larger than the sum of its proper divisors (298890452213).

21221222102011 is an equidigital number, since it uses as much as digits as its factorization.

21221222102011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298890452212.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221222102011 its reverse (11020122212212), we get a palindrome (32241344314223).

The spelling of 21221222102011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred two thousand, eleven".