1221346285 has 4 divisors (see below), whose sum is σ = 1465615548. Its totient is φ = 977077024.

The previous prime is 1221346279. The next prime is 1221346289. The reversal of 1221346285 is 5826431221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567725929 + 653620356 = 23827^2 + 25566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221346285 - 2²⁹ = 684475373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221346285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221346289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122134624 + ... + 122134633.

It is an arithmetic number, because the mean of its divisors is an integer number (366403887).

Almost surely, 2^1221346285 is an apocalyptic number.

It is an amenable number.

1221346285 is a deficient number, since it is larger than the sum of its proper divisors (244269263).

1221346285 is an equidigital number, since it uses as much as digits as its factorization.

1221346285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244269262.

The product of its digits is 23040, while the sum is 34.

The square root of 1221346285 is about 34947.7650930642. The cubic root of 1221346285 is about 1068.9226308923.

The spelling of 1221346285 in words is "one billion, two hundred twenty-one million, three hundred forty-six thousand, two hundred eighty-five".