1221010110221 has 8 divisors (see below), whose sum is σ = 1334319547584. Its totient is φ = 1108085425920.

The previous prime is 1221010110181. The next prime is 1221010110233. The reversal of 1221010110221 is 1220110101221.

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

It is not a de Polignac number, because 1221010110221 - 2¹⁰ = 1221010109197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221010110196 and 1221010110205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010110821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96181625 + ... + 96194318.

It is an arithmetic number, because the mean of its divisors is an integer number (166789943448).

Almost surely, 2^{1221010110221} is an apocalyptic number.

1221010110221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221010110221 is a deficient number, since it is larger than the sum of its proper divisors (113309437363).

1221010110221 is a wasteful number, since it uses less digits than its factorization.

1221010110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192376531.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221010110221 its reverse (1220110101221), we get a palindrome (2441120211442).

The spelling of 1221010110221 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred ten thousand, two hundred twenty-one".