1221346005 has 16 divisors (see below), whose sum is σ = 2131804224. Its totient is φ = 592167680.

The previous prime is 1221345989. The next prime is 1221346037. The reversal of 1221346005 is 5006431221.

It is not a de Polignac number, because 1221346005 - 2⁴ = 1221345989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3700884 + ... + 3701213.

It is an arithmetic number, because the mean of its divisors is an integer number (133237764).

Almost surely, 2^1221346005 is an apocalyptic number.

1221346005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1221346005 is a deficient number, since it is larger than the sum of its proper divisors (910458219).

1221346005 is a wasteful number, since it uses less digits than its factorization.

1221346005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7402116.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1221346005 is about 34947.7610870854. The cubic root of 1221346005 is about 1068.9225492070.

Adding to 1221346005 its reverse (5006431221), we get a palindrome (6227777226).

The spelling of 1221346005 in words is "one billion, two hundred twenty-one million, three hundred forty-six thousand, five".