1221073633 has 8 divisors (see below), whose sum is σ = 1320798528. Its totient is φ = 1122176784.

The previous prime is 1221073619. The next prime is 1221073769. The reversal of 1221073633 is 3363701221.

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 1221073633 - 2⁹ = 1221073121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221073033) 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, 203941 + ... + 209842.

It is an arithmetic number, because the mean of its divisors is an integer number (165099816).

Almost surely, 2^1221073633 is an apocalyptic number.

1221073633 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1221073633 is a deficient number, since it is larger than the sum of its proper divisors (99724895).

1221073633 is a wasteful number, since it uses less digits than its factorization.

1221073633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414023.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 1221073633 is about 34943.8640250331. The cubic root of 1221073633 is about 1068.8430832689.

Adding to 1221073633 its reverse (3363701221), we get a palindrome (4584774854).

The spelling of 1221073633 in words is "one billion, two hundred twenty-one million, seventy-three thousand, six hundred thirty-three".