1221231033013 has 24 divisors (see below), whose sum is σ = 1378831113920. Its totient is φ = 1078327157760.

The previous prime is 1221231032993. The next prime is 1221231033031. The reversal of 1221231033013 is 3103301321221.

It is not a de Polignac number, because 1221231033013 - 2³³ = 1212641098421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221231033073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 514068 + ... + 1645213.

Almost surely, 2^{1221231033013} is an apocalyptic number.

It is an amenable number.

1221231033013 is a deficient number, since it is larger than the sum of its proper divisors (157600080907).

1221231033013 is a wasteful number, since it uses less digits than its factorization.

1221231033013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159437 (or 2159420 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1221231033013 its reverse (3103301321221), we get a palindrome (4324532354234).

The spelling of 1221231033013 in words is "one trillion, two hundred twenty-one billion, two hundred thirty-one million, thirty-three thousand, thirteen".