21221120012101 has 4 divisors (see below), whose sum is σ = 21221210731392. Its totient is φ = 21221029292812.

The previous prime is 21221120012011. The next prime is 21221120012143. The reversal of 21221120012101 is 10121002112212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21221120012101 - 2¹¹ = 21221120010053 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 (21221120012501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45007855 + ... + 45476908.

It is an arithmetic number, because the mean of its divisors is an integer number (5305302682848).

Almost surely, 2^{21221120012101} is an apocalyptic number.

It is an amenable number.

21221120012101 is a deficient number, since it is larger than the sum of its proper divisors (90719291).

21221120012101 is an equidigital number, since it uses as much as digits as its factorization.

21221120012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90719290.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221120012101 its reverse (10121002112212), we get a palindrome (31342122124313).

The spelling of 21221120012101 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, twelve thousand, one hundred one".