21221222210011 has 4 divisors (see below), whose sum is σ = 21221728036992. Its totient is φ = 21220716383032.

The previous prime is 21221222210009. The next prime is 21221222210099. The reversal of 21221222210011 is 11001222212212.

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 21221222210011 - 2¹ = 21221222210009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21221222210311) 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, 252850555 + ... + 252934468.

It is an arithmetic number, because the mean of its divisors is an integer number (5305432009248).

Almost surely, 2^{21221222210011} is an apocalyptic number.

21221222210011 is a deficient number, since it is larger than the sum of its proper divisors (505826981).

21221222210011 is an equidigital number, since it uses as much as digits as its factorization.

21221222210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505826980.

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

Adding to 21221222210011 its reverse (11001222212212), we get a palindrome (32222444422223).

The spelling of 21221222210011 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred ten thousand, eleven".