21210110221011 has 16 divisors (see below), whose sum is σ = 28843226902944. Its totient is φ = 13859079663104.

The previous prime is 21210110221009. The next prime is 21210110221061. The reversal of 21210110221011 is 11012201101212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21210110221011 - 2¹ = 21210110221009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210110221061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68113296 + ... + 68423981.

It is an arithmetic number, because the mean of its divisors is an integer number (1802701681434).

Almost surely, 2^{21210110221011} is an apocalyptic number.

21210110221011 is a deficient number, since it is larger than the sum of its proper divisors (7633116681933).

21210110221011 is a wasteful number, since it uses less digits than its factorization.

21210110221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136538310.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210110221011 its reverse (11012201101212), we get a palindrome (32222311322223).

The spelling of 21210110221011 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, two hundred twenty-one thousand, eleven".