1221441123403 has 4 divisors (see below), whose sum is σ = 1249846730968. Its totient is φ = 1193035515840.

The previous prime is 1221441123299. The next prime is 1221441123493. The reversal of 1221441123403 is 3043211441221.

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 1221441123403 - 2²¹ = 1221439026251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221441123493) 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, 14202803718 + ... + 14202803803.

It is an arithmetic number, because the mean of its divisors is an integer number (312461682742).

Almost surely, 2^{1221441123403} is an apocalyptic number.

1221441123403 is a deficient number, since it is larger than the sum of its proper divisors (28405607565).

1221441123403 is an equidigital number, since it uses as much as digits as its factorization.

1221441123403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28405607564.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1221441123403 its reverse (3043211441221), we get a palindrome (4264652564624).

The spelling of 1221441123403 in words is "one trillion, two hundred twenty-one billion, four hundred forty-one million, one hundred twenty-three thousand, four hundred three".