221020121103 has 4 divisors (see below), whose sum is σ = 294693494808. Its totient is φ = 147346747400.

The previous prime is 221020121099. The next prime is 221020121111. The reversal of 221020121103 is 301121020122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221020121103 - 2² = 221020121099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020128103) 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, 36836686848 + ... + 36836686853.

It is an arithmetic number, because the mean of its divisors is an integer number (73673373702).

Almost surely, 2^221020121103 is an apocalyptic number.

221020121103 is a deficient number, since it is larger than the sum of its proper divisors (73673373705).

221020121103 is an equidigital number, since it uses as much as digits as its factorization.

221020121103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73673373704.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 221020121103 its reverse (301121020122), we get a palindrome (522141141225).

The spelling of 221020121103 in words is "two hundred twenty-one billion, twenty million, one hundred twenty-one thousand, one hundred three".