1221334005 has 32 divisors (see below), whose sum is σ = 1975881600. Its totient is φ = 644172032.

The previous prime is 1221333983. The next prime is 1221334007. The reversal of 1221334005 is 5004331221.

It is a cyclic number.

It is not a de Polignac number, because 1221334005 - 2²⁸ = 952898549 is a prime.

It is a super-3 number, since 3×1221334005³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221334007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 527791 + ... + 530099.

It is an arithmetic number, because the mean of its divisors is an integer number (61746300).

Almost surely, 2^1221334005 is an apocalyptic number.

1221334005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221334005 is a deficient number, since it is larger than the sum of its proper divisors (754547595).

1221334005 is a wasteful number, since it uses less digits than its factorization.

1221334005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1221334005 is about 34947.5894018457. The cubic root of 1221334005 is about 1068.9190483938.

Adding to 1221334005 its reverse (5004331221), we get a palindrome (6225665226).

The spelling of 1221334005 in words is "one billion, two hundred twenty-one million, three hundred thirty-four thousand, five".