1221320031203 has 8 divisors (see below), whose sum is σ = 1229128982880. Its totient is φ = 1213511457600.

The previous prime is 1221320031133. The next prime is 1221320031223. The reversal of 1221320031203 is 3021300231221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221320031203 - 2⁸ = 1221320030947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221320031223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9462503 + ... + 9590703.

It is an arithmetic number, because the mean of its divisors is an integer number (153641122860).

Almost surely, 2^{1221320031203} is an apocalyptic number.

1221320031203 is a deficient number, since it is larger than the sum of its proper divisors (7808951677).

1221320031203 is a wasteful number, since it uses less digits than its factorization.

1221320031203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189037.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1221320031203 its reverse (3021300231221), we get a palindrome (4242620262424).

The spelling of 1221320031203 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, thirty-one thousand, two hundred three".