21021120120211 has 32 divisors (see below), whose sum is σ = 23584355020800. Its totient is φ = 18643525702560.

The previous prime is 21021120120191. The next prime is 21021120120227. The reversal of 21021120120211 is 11202102112012.

It is a cyclic number.

It is not a de Polignac number, because 21021120120211 - 2⁷ = 21021120120083 is a prime.

It is a super-2 number, since 2×21021120120211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021120124211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4056906 + ... + 7648576.

It is an arithmetic number, because the mean of its divisors is an integer number (737011094400).

Almost surely, 2^{21021120120211} is an apocalyptic number.

21021120120211 is a deficient number, since it is larger than the sum of its proper divisors (2563234900589).

21021120120211 is a wasteful number, since it uses less digits than its factorization.

21021120120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591999.

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

Adding to 21021120120211 its reverse (11202102112012), we get a palindrome (32223222232223).

The spelling of 21021120120211 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred twenty thousand, two hundred eleven".