1221333203129 has 8 divisors (see below), whose sum is σ = 1336843910472. Its totient is φ = 1108902781440.

The previous prime is 1221333203113. The next prime is 1221333203203. The reversal of 1221333203129 is 9213023331221.

It can be written as a sum of positive squares in 4 ways, for example, as 47577643129 + 1173755560000 = 218123^2 + 1083400^2 .

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 1221333203129 - 2⁴ = 1221333203113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221333203095 and 1221333203104.

It is not an unprimeable number, because it can be changed into a prime (1221333208129) 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, 770070584 + ... + 770072169.

It is an arithmetic number, because the mean of its divisors is an integer number (167105488809).

Almost surely, 2^{1221333203129} is an apocalyptic number.

It is an amenable number.

1221333203129 is a deficient number, since it is larger than the sum of its proper divisors (115510707343).

1221333203129 is a wasteful number, since it uses less digits than its factorization.

1221333203129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540142827.

The product of its (nonzero) digits is 11664, while the sum is 32.

The spelling of 1221333203129 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-three million, two hundred three thousand, one hundred twenty-nine".