1221307045 has 8 divisors (see below), whose sum is σ = 1674935424. Its totient is φ = 837467664.

The previous prime is 1221307033. The next prime is 1221307067. The reversal of 1221307045 is 5407031221.

It is a happy number.

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 1221307045 - 2¹⁷ = 1221175973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17447209 + ... + 17447278.

It is an arithmetic number, because the mean of its divisors is an integer number (209366928).

Almost surely, 2^1221307045 is an apocalyptic number.

It is an amenable number.

1221307045 is a deficient number, since it is larger than the sum of its proper divisors (453628379).

1221307045 is an equidigital number, since it uses as much as digits as its factorization.

1221307045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34894499.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1221307045 is about 34947.2036792645. The cubic root of 1221307045 is about 1068.9111831498.

Adding to 1221307045 its reverse (5407031221), we get a palindrome (6628338266).

The spelling of 1221307045 in words is "one billion, two hundred twenty-one million, three hundred seven thousand, forty-five".