21210121110101 has 8 divisors (see below), whose sum is σ = 26443787358144. Its totient is φ = 16527367098720.

The previous prime is 21210121110049. The next prime is 21210121110103. The reversal of 21210121110101 is 10101112101212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210121110101 - 2¹⁴ = 21210121093717 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 (21210121110103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137728059080 + ... + 137728059233.

It is an arithmetic number, because the mean of its divisors is an integer number (3305473419768).

Almost surely, 2^{21210121110101} is an apocalyptic number.

It is an amenable number.

21210121110101 is a deficient number, since it is larger than the sum of its proper divisors (5233666248043).

21210121110101 is a wasteful number, since it uses less digits than its factorization.

21210121110101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275456118331.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21210121110101 its reverse (10101112101212), we get a palindrome (31311233211313).

The spelling of 21210121110101 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, one hundred ten thousand, one hundred one".