21011022110221 has 32 divisors (see below), whose sum is σ = 26004804739200. Its totient is φ = 16689918689280.

The previous prime is 21011022110213. The next prime is 21011022110263. The reversal of 21011022110221 is 12201122011012.

It is not a de Polignac number, because 21011022110221 - 2³ = 21011022110213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011022110195 and 21011022110204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011022110821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129445 + ... + 6483733.

It is an arithmetic number, because the mean of its divisors is an integer number (812650148100).

Almost surely, 2^{21011022110221} is an apocalyptic number.

It is an amenable number.

21011022110221 is a deficient number, since it is larger than the sum of its proper divisors (4993782628979).

21011022110221 is a wasteful number, since it uses less digits than its factorization.

21011022110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355549.

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

Adding to 21011022110221 its reverse (12201122011012), we get a palindrome (33212144121233).

The spelling of 21011022110221 in words is "twenty-one trillion, eleven billion, twenty-two million, one hundred ten thousand, two hundred twenty-one".