1221203101133 has 4 divisors (see below), whose sum is σ = 1221237803040. Its totient is φ = 1221168399228.

The previous prime is 1221203101123. The next prime is 1221203101219. The reversal of 1221203101133 is 3311013021221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221203101133 - 2¹⁶ = 1221203035597 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 (1221203101123) 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, 17298113 + ... + 17368566.

It is an arithmetic number, because the mean of its divisors is an integer number (305309450760).

Almost surely, 2^{1221203101133} is an apocalyptic number.

It is an amenable number.

1221203101133 is a deficient number, since it is larger than the sum of its proper divisors (34701907).

1221203101133 is an equidigital number, since it uses as much as digits as its factorization.

1221203101133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34701906.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1221203101133 its reverse (3311013021221), we get a palindrome (4532216122354).

The spelling of 1221203101133 in words is "one trillion, two hundred twenty-one billion, two hundred three million, one hundred one thousand, one hundred thirty-three".