1221110103 has 4 divisors (see below), whose sum is σ = 1628146808. Its totient is φ = 814073400.

The previous prime is 1221110101. The next prime is 1221110123. The reversal of 1221110103 is 3010111221.

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

It is not a de Polignac number, because 1221110103 - 2¹ = 1221110101 is a prime.

It is a super-2 number, since 2×1221110103² = 2982219767297341218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110101) 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, 203518348 + ... + 203518353.

It is an arithmetic number, because the mean of its divisors is an integer number (407036702).

Almost surely, 2^1221110103 is an apocalyptic number.

1221110103 is a deficient number, since it is larger than the sum of its proper divisors (407036705).

1221110103 is an equidigital number, since it uses as much as digits as its factorization.

1221110103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407036704.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1221110103 is about 34944.3858581032. The cubic root of 1221110103 is about 1068.8537242650.

Adding to 1221110103 its reverse (3010111221), we get a palindrome (4231221324).

The spelling of 1221110103 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, one hundred three".