21221102011211 has 32 divisors (see below), whose sum is σ = 22105033187328. Its totient is φ = 20350471518720.

The previous prime is 21221102011159. The next prime is 21221102011231. The reversal of 21221102011211 is 11211020112212.

It is a cyclic number.

It is not a de Polignac number, because 21221102011211 - 2⁶ = 21221102011147 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221102011211.

It is not an unprimeable number, because it can be changed into a prime (21221102011231) 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, 3669563426 + ... + 3669569208.

It is an arithmetic number, because the mean of its divisors is an integer number (690782287104).

Almost surely, 2^{21221102011211} is an apocalyptic number.

21221102011211 is a deficient number, since it is larger than the sum of its proper divisors (883931176117).

21221102011211 is a wasteful number, since it uses less digits than its factorization.

21221102011211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8051.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21221102011211 its reverse (11211020112212), we get a palindrome (32432122123423).

The spelling of 21221102011211 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, eleven thousand, two hundred eleven".