1231212440103 has 4 divisors (see below), whose sum is σ = 1641616586808. Its totient is φ = 820808293400.

The previous prime is 1231212440021. The next prime is 1231212440149. The reversal of 1231212440103 is 3010442121321.

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 1231212440103 - 2²¹ = 1231210342951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231212480103) 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, 205202073348 + ... + 205202073353.

It is an arithmetic number, because the mean of its divisors is an integer number (410404146702).

Almost surely, 2^{1231212440103} is an apocalyptic number.

1231212440103 is a deficient number, since it is larger than the sum of its proper divisors (410404146705).

1231212440103 is an equidigital number, since it uses as much as digits as its factorization.

1231212440103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410404146704.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 1231212440103 its reverse (3010442121321), we get a palindrome (4241654561424).

The spelling of 1231212440103 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, four hundred forty thousand, one hundred three".