1221013233133 has 4 divisors (see below), whose sum is σ = 1221161584608. Its totient is φ = 1220864881660.

The previous prime is 1221013233043. The next prime is 1221013233149. The reversal of 1221013233133 is 3313323101221.

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 a de Polignac number, because none of the positive numbers 2^k-1221013233133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221013233098 and 1221013233107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221013231133) 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, 74163391 + ... + 74179852.

It is an arithmetic number, because the mean of its divisors is an integer number (305290396152).

Almost surely, 2^{1221013233133} is an apocalyptic number.

It is an amenable number.

1221013233133 is a deficient number, since it is larger than the sum of its proper divisors (148351475).

1221013233133 is an equidigital number, since it uses as much as digits as its factorization.

1221013233133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148351474.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 1221013233133 its reverse (3313323101221), we get a palindrome (4534336334354).

The spelling of 1221013233133 in words is "one trillion, two hundred twenty-one billion, thirteen million, two hundred thirty-three thousand, one hundred thirty-three".