1221534103 has 4 divisors (see below), whose sum is σ = 1236996640. Its totient is φ = 1206071568.

The previous prime is 1221534101. The next prime is 1221534113. The reversal of 1221534103 is 3014351221.

It is a happy number.

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 1221534103 - 2¹ = 1221534101 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 (1221534101) 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, 7731150 + ... + 7731307.

It is an arithmetic number, because the mean of its divisors is an integer number (309249160).

Almost surely, 2^1221534103 is an apocalyptic number.

1221534103 is a deficient number, since it is larger than the sum of its proper divisors (15462537).

1221534103 is an equidigital number, since it uses as much as digits as its factorization.

1221534103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15462536.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1221534103 is about 34950.4521143862. The cubic root of 1221534103 is about 1068.9774208737.

Adding to 1221534103 its reverse (3014351221), we get a palindrome (4235885324).

The spelling of 1221534103 in words is "one billion, two hundred twenty-one million, five hundred thirty-four thousand, one hundred three".