1231021012403 has 16 divisors (see below), whose sum is σ = 1523473538496. Its totient is φ = 968613448320.

The previous prime is 1231021012379. The next prime is 1231021012423. The reversal of 1231021012403 is 3042101201321.

It is not a de Polignac number, because 1231021012403 - 2¹² = 1231021008307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231021012423) 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, 37352876 + ... + 37385817.

It is an arithmetic number, because the mean of its divisors is an integer number (95217096156).

Almost surely, 2^{1231021012403} is an apocalyptic number.

1231021012403 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231021012403 is a deficient number, since it is larger than the sum of its proper divisors (292452526093).

1231021012403 is a wasteful number, since it uses less digits than its factorization.

1231021012403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74738894.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1231021012403 its reverse (3042101201321), we get a palindrome (4273122213724).

The spelling of 1231021012403 in words is "one trillion, two hundred thirty-one billion, twenty-one million, twelve thousand, four hundred three".