221221222103 has 4 divisors (see below), whose sum is σ = 252824253840. Its totient is φ = 189618190368.

The previous prime is 221221222091. The next prime is 221221222147. The reversal of 221221222103 is 301222122122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301222122122 = 2 ⋅150611061061.

It is a cyclic number.

It is not a de Polignac number, because 221221222103 - 2¹⁴ = 221221205719 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 (221221222163) 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, 15801515858 + ... + 15801515871.

It is an arithmetic number, because the mean of its divisors is an integer number (63206063460).

Almost surely, 2^221221222103 is an apocalyptic number.

221221222103 is a deficient number, since it is larger than the sum of its proper divisors (31603031737).

221221222103 is an equidigital number, since it uses as much as digits as its factorization.

221221222103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31603031736.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221221222103 its reverse (301222122122), we get a palindrome (522443344225).

The spelling of 221221222103 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred three".