1221222321 has 48 divisors (see below), whose sum is σ = 2032056000. Its totient is φ = 698958720.

The previous prime is 1221222287. The next prime is 1221222341. The reversal of 1221222321 is 1232221221.

1221222321 is a `hidden beast` number, since 122 + 1 + 222 + 321 = 666.

1221222321 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1221222321 - 2⁷ = 1221222193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221222294 and 1221222303.

It is not an unprimeable number, because it can be changed into a prime (1221222341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 730875 + ... + 732543.

It is an arithmetic number, because the mean of its divisors is an integer number (42334500).

Almost surely, 2^1221222321 is an apocalyptic number.

1221222321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221222321 is a deficient number, since it is larger than the sum of its proper divisors (810833679).

1221222321 is a wasteful number, since it uses less digits than its factorization.

1221222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094 (or 2091 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1221222321 is about 34945.9914868644. The cubic root of 1221222321 is about 1068.8864652255.

Adding to 1221222321 its reverse (1232221221), we get a palindrome (2453443542).

The spelling of 1221222321 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred twenty-one".