1221153213441 has 8 divisors (see below), whose sum is σ = 1860804896704. Its totient is φ = 697801836240.

The previous prime is 1221153213431. The next prime is 1221153213481. The reversal of 1221153213441 is 1443123511221.

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

It is not a de Polignac number, because 1221153213441 - 2²² = 1221149019137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221153213399 and 1221153213408.

It is not an unprimeable number, because it can be changed into a prime (1221153213431) 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, 29075076490 + ... + 29075076531.

It is an arithmetic number, because the mean of its divisors is an integer number (232600612088).

Almost surely, 2^{1221153213441} is an apocalyptic number.

It is an amenable number.

1221153213441 is a deficient number, since it is larger than the sum of its proper divisors (639651683263).

1221153213441 is an equidigital number, since it uses as much as digits as its factorization.

1221153213441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58150153031.

The product of its digits is 5760, while the sum is 30.

Adding to 1221153213441 its reverse (1443123511221), we get a palindrome (2664276724662).

The spelling of 1221153213441 in words is "one trillion, two hundred twenty-one billion, one hundred fifty-three million, two hundred thirteen thousand, four hundred forty-one".