1221221433 has 16 divisors (see below), whose sum is σ = 1642320000. Its totient is φ = 807156480.

The previous prime is 1221221423. The next prime is 1221221437. The reversal of 1221221433 is 3341221221.

It is not a de Polignac number, because 1221221433 - 2²⁰ = 1220172857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221221437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265473 + ... + 270033.

It is an arithmetic number, because the mean of its divisors is an integer number (102645000).

Almost surely, 2^1221221433 is an apocalyptic number.

It is an amenable number.

1221221433 is a deficient number, since it is larger than the sum of its proper divisors (421098567).

1221221433 is a wasteful number, since it uses less digits than its factorization.

1221221433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5312.

The product of its digits is 576, while the sum is 21.

The square root of 1221221433 is about 34945.9787815422. The cubic root of 1221221433 is about 1068.8862061486.

Adding to 1221221433 its reverse (3341221221), we get a palindrome (4562442654).

The spelling of 1221221433 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, four hundred thirty-three".