21201000110221 has 16 divisors (see below), whose sum is σ = 21645449570880. Its totient is φ = 20759396823040.

The previous prime is 21201000110219. The next prime is 21201000110249. The reversal of 21201000110221 is 12201100010212.

It is a cyclic number.

It is not a de Polignac number, because 21201000110221 - 2¹ = 21201000110219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201000120221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410997651 + ... + 411049231.

It is an arithmetic number, because the mean of its divisors is an integer number (1352840598180).

Almost surely, 2^{21201000110221} is an apocalyptic number.

It is an amenable number.

21201000110221 is a deficient number, since it is larger than the sum of its proper divisors (444449460659).

21201000110221 is a wasteful number, since it uses less digits than its factorization.

21201000110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79004.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201000110221 its reverse (12201100010212), we get a palindrome (33402100120433).

The spelling of 21201000110221 in words is "twenty-one trillion, two hundred one billion, one hundred ten thousand, two hundred twenty-one".