21210011221101 has 16 divisors (see below), whose sum is σ = 28342109906880. Its totient is φ = 14108981045760.

The previous prime is 21210011221093. The next prime is 21210011221123. The reversal of 21210011221101 is 10112211001212.

It is a happy number.

It is not a de Polignac number, because 21210011221101 - 2³ = 21210011221093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210011221801) 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, 1406781 + ... + 6663261.

It is an arithmetic number, because the mean of its divisors is an integer number (1771381869180).

Almost surely, 2^{21210011221101} is an apocalyptic number.

It is an amenable number.

21210011221101 is a deficient number, since it is larger than the sum of its proper divisors (7132098685779).

21210011221101 is a wasteful number, since it uses less digits than its factorization.

21210011221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5259436.

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

Adding to 21210011221101 its reverse (10112211001212), we get a palindrome (31322222222313).

The spelling of 21210011221101 in words is "twenty-one trillion, two hundred ten billion, eleven million, two hundred twenty-one thousand, one hundred one".