1221203220113 has 8 divisors (see below), whose sum is σ = 1251003176136. Its totient is φ = 1191403955200.

The previous prime is 1221203220067. The next prime is 1221203220151. The reversal of 1221203220113 is 3110223021221.

It can be written as a sum of positive squares in 4 ways, for example, as 107317173649 + 1113886046464 = 327593^2 + 1055408^2 .

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 1221203220113 - 2¹⁸ = 1221202957969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221203210113) 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, 6676445 + ... + 6856917.

It is an arithmetic number, because the mean of its divisors is an integer number (156375397017).

Almost surely, 2^{1221203220113} is an apocalyptic number.

It is an amenable number.

1221203220113 is a deficient number, since it is larger than the sum of its proper divisors (29799956023).

1221203220113 is a wasteful number, since it uses less digits than its factorization.

1221203220113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345555.

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

Adding to 1221203220113 its reverse (3110223021221), we get a palindrome (4331426241334).

The spelling of 1221203220113 in words is "one trillion, two hundred twenty-one billion, two hundred three million, two hundred twenty thousand, one hundred thirteen".