21210100221101 has 16 divisors (see below), whose sum is σ = 23490636761088. Its totient is φ = 18988900316400.

The previous prime is 21210100221097. The next prime is 21210100221119. The reversal of 21210100221101 is 10112200101212.

It is a cyclic number.

It is not a de Polignac number, because 21210100221101 - 2² = 21210100221097 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 (21210100221901) 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 15 ways as a sum of consecutive naturals, for example, 14615945 + ... + 16001438.

It is an arithmetic number, because the mean of its divisors is an integer number (1468164797568).

Almost surely, 2^{21210100221101} is an apocalyptic number.

It is an amenable number.

21210100221101 is a deficient number, since it is larger than the sum of its proper divisors (2280536539987).

21210100221101 is a wasteful number, since it uses less digits than its factorization.

21210100221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30618352.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210100221101 its reverse (10112200101212), we get a palindrome (31322300322313).

The spelling of 21210100221101 in words is "twenty-one trillion, two hundred ten billion, one hundred million, two hundred twenty-one thousand, one hundred one".