21021220110121 has 32 divisors (see below), whose sum is σ = 27104706478080. Its totient is φ = 15828724641600.

The previous prime is 21021220110119. The next prime is 21021220110173. The reversal of 21021220110121 is 12101102212012.

It is a cyclic number.

It is not a de Polignac number, because 21021220110121 - 2¹ = 21021220110119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021220110095 and 21021220110104.

It is not an unprimeable number, because it can be changed into a prime (21021220110421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36477210 + ... + 37049011.

It is an arithmetic number, because the mean of its divisors is an integer number (847022077440).

Almost surely, 2^{21021220110121} is an apocalyptic number.

It is an amenable number.

21021220110121 is a deficient number, since it is larger than the sum of its proper divisors (6083486367959).

21021220110121 is a wasteful number, since it uses less digits than its factorization.

21021220110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73526365.

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

Adding to 21021220110121 its reverse (12101102212012), we get a palindrome (33122322322133).

The spelling of 21021220110121 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, one hundred ten thousand, one hundred twenty-one".