1243121010403 has 4 divisors (see below), whose sum is σ = 1243176880680. Its totient is φ = 1243065140128.

The previous prime is 1243121010371. The next prime is 1243121010427. The reversal of 1243121010403 is 3040101213421.

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 1243121010403 - 2⁵ = 1243121010371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243121010503) 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, 27901750 + ... + 27946267.

It is an arithmetic number, because the mean of its divisors is an integer number (310794220170).

Almost surely, 2^{1243121010403} is an apocalyptic number.

1243121010403 is a deficient number, since it is larger than the sum of its proper divisors (55870277).

1243121010403 is an equidigital number, since it uses as much as digits as its factorization.

1243121010403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55870276.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1243121010403 its reverse (3040101213421), we get a palindrome (4283222223824).

The spelling of 1243121010403 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, ten thousand, four hundred three".