1221011441 has 8 divisors (see below), whose sum is σ = 1336492584. Its totient is φ = 1108609920.

The previous prime is 1221011437. The next prime is 1221011453. The reversal of 1221011441 is 1441101221.

It can be written as a sum of positive squares in 4 ways, for example, as 8579041 + 1212432400 = 2929^2 + 34820^2 .

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 1221011441 - 2² = 1221011437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221011461) 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, 769076 + ... + 770661.

It is an arithmetic number, because the mean of its divisors is an integer number (167061573).

Almost surely, 2^1221011441 is an apocalyptic number.

It is an amenable number.

1221011441 is a deficient number, since it is larger than the sum of its proper divisors (115481143).

1221011441 is a wasteful number, since it uses less digits than its factorization.

1221011441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539811.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 1221011441 is about 34942.9741292867. The cubic root of 1221011441 is about 1068.8249367745.

Adding to 1221011441 its reverse (1441101221), we get a palindrome (2662112662).

The spelling of 1221011441 in words is "one billion, two hundred twenty-one million, eleven thousand, four hundred forty-one".