1221354441 has 12 divisors (see below), whose sum is σ = 1840882368. Its totient is φ = 778834584.

The previous prime is 1221354437. The next prime is 1221354469. The reversal of 1221354441 is 1444531221.

1221354441 is a `hidden beast` number, since 1 + 2 + 213 + 5 + 4 + 441 = 666.

It is not a de Polignac number, because 1221354441 - 2² = 1221354437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221354481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2949925 + ... + 2950338.

It is an arithmetic number, because the mean of its divisors is an integer number (153406864).

Almost surely, 2^1221354441 is an apocalyptic number.

It is an amenable number.

1221354441 is a deficient number, since it is larger than the sum of its proper divisors (619527927).

1221354441 is a wasteful number, since it uses less digits than its factorization.

1221354441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5900292 (or 5900289 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 1221354441 is about 34947.8817813040. The cubic root of 1221354441 is about 1068.9250102649.

Adding to 1221354441 its reverse (1444531221), we get a palindrome (2665885662).

The spelling of 1221354441 in words is "one billion, two hundred twenty-one million, three hundred fifty-four thousand, four hundred forty-one".