21120102220211 has 4 divisors (see below), whose sum is σ = 21123600669552. Its totient is φ = 21116603770872.

The previous prime is 21120102220177. The next prime is 21120102220289. The reversal of 21120102220211 is 11202220102112.

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 21120102220211 - 2²² = 21120098025907 is a prime.

It is a super-2 number, since 2×21120102220211² (a number of 27 digits) contains 22 as substring.

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 21120102220211.

It is not an unprimeable number, because it can be changed into a prime (21120104220211) 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, 1749215615 + ... + 1749227688.

It is an arithmetic number, because the mean of its divisors is an integer number (5280900167388).

Almost surely, 2^{21120102220211} is an apocalyptic number.

21120102220211 is a deficient number, since it is larger than the sum of its proper divisors (3498449341).

21120102220211 is an equidigital number, since it uses as much as digits as its factorization.

21120102220211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498449340.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21120102220211 its reverse (11202220102112), we get a palindrome (32322322322323).

The spelling of 21120102220211 in words is "twenty-one trillion, one hundred twenty billion, one hundred two million, two hundred twenty thousand, two hundred eleven".