21220101110121 has 16 divisors (see below), whose sum is σ = 28681285950720. Its totient is φ = 13952828361600.

The previous prime is 21220101110101. The next prime is 21220101110203. The reversal of 21220101110121 is 12101110102212.

It is a happy number.

It is not a de Polignac number, because 21220101110121 - 2¹⁹ = 21220100585833 is a prime.

It is a super-2 number, since 2×21220101110121² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220101110121.

It is not an unprimeable number, because it can be changed into a prime (21220101110101) 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, 32427715 + ... + 33075623.

It is an arithmetic number, because the mean of its divisors is an integer number (1792580371920).

Almost surely, 2^{21220101110121} is an apocalyptic number.

It is an amenable number.

21220101110121 is a deficient number, since it is larger than the sum of its proper divisors (7461184840599).

21220101110121 is a wasteful number, since it uses less digits than its factorization.

21220101110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797536.

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

Adding to 21220101110121 its reverse (12101110102212), we get a palindrome (33321211212333).

The spelling of 21220101110121 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred ten thousand, one hundred twenty-one".