12121031103 has 4 divisors (see below), whose sum is σ = 16161374808. Its totient is φ = 8080687400.

The previous prime is 12121031101. The next prime is 12121031123. The reversal of 12121031103 is 30113012121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30113012121 = 3 ⋅10037670707.

It is a cyclic number.

It is not a de Polignac number, because 12121031103 - 2¹ = 12121031101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121031101) 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, 2020171848 + ... + 2020171853.

It is an arithmetic number, because the mean of its divisors is an integer number (4040343702).

Almost surely, 2^12121031103 is an apocalyptic number.

12121031103 is a deficient number, since it is larger than the sum of its proper divisors (4040343705).

12121031103 is an equidigital number, since it uses as much as digits as its factorization.

12121031103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040343704.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 12121031103 its reverse (30113012121), we get a palindrome (42234043224).

The spelling of 12121031103 in words is "twelve billion, one hundred twenty-one million, thirty-one thousand, one hundred three".