21221221100011 has 4 divisors (see below), whose sum is σ = 22143882886992. Its totient is φ = 20298559313032.

The previous prime is 21221221099999. The next prime is 21221221100063. The reversal of 21221221100011 is 11000112212212.

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 21221221100011 - 2⁴¹ = 19022197844459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221221104011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461330893456 + ... + 461330893501.

It is an arithmetic number, because the mean of its divisors is an integer number (5535970721748).

Almost surely, 2^{21221221100011} is an apocalyptic number.

21221221100011 is a deficient number, since it is larger than the sum of its proper divisors (922661786981).

21221221100011 is an equidigital number, since it uses as much as digits as its factorization.

21221221100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922661786980.

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

Adding to 21221221100011 its reverse (11000112212212), we get a palindrome (32221333312223).

The spelling of 21221221100011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred thousand, eleven".