1221434020103 has 16 divisors (see below), whose sum is σ = 1411159470336. Its totient is φ = 1046264039040.

The previous prime is 1221434020087. The next prime is 1221434020201. The reversal of 1221434020103 is 3010204341221.

It is not a de Polignac number, because 1221434020103 - 2⁴ = 1221434020087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221434020403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36011426 + ... + 36045327.

It is an arithmetic number, because the mean of its divisors is an integer number (88197466896).

Almost surely, 2^{1221434020103} is an apocalyptic number.

1221434020103 is a deficient number, since it is larger than the sum of its proper divisors (189725450233).

1221434020103 is a wasteful number, since it uses less digits than its factorization.

1221434020103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72056854.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1221434020103 its reverse (3010204341221), we get a palindrome (4231638361324).

The spelling of 1221434020103 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-four million, twenty thousand, one hundred three".