1243121102203 has 16 divisors (see below), whose sum is σ = 1281988302336. Its totient is φ = 1204673909760.

The previous prime is 1243121102183. The next prime is 1243121102281. The reversal of 1243121102203 is 3022011213421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243121102203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243121102603) 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, 7629475 + ... + 7790707.

It is an arithmetic number, because the mean of its divisors is an integer number (80124268896).

Almost surely, 2^{1243121102203} is an apocalyptic number.

1243121102203 is a deficient number, since it is larger than the sum of its proper divisors (38867200133).

1243121102203 is a wasteful number, since it uses less digits than its factorization.

1243121102203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162534.

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

Adding to 1243121102203 its reverse (3022011213421), we get a palindrome (4265132315624).

The spelling of 1243121102203 in words is "one trillion, two hundred forty-three billion, one hundred twenty-one million, one hundred two thousand, two hundred three".