1221435115 has 8 divisors (see below), whose sum is σ = 1468012608. Its totient is φ = 975621120.

The previous prime is 1221435077. The next prime is 1221435179. The reversal of 1221435115 is 5115341221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221435115 - 2²⁷ = 1087217387 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 1221435115.

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, 187347 + ... + 193756.

It is an arithmetic number, because the mean of its divisors is an integer number (183501576).

Almost surely, 2^1221435115 is an apocalyptic number.

1221435115 is a deficient number, since it is larger than the sum of its proper divisors (246577493).

1221435115 is an equidigital number, since it uses as much as digits as its factorization.

1221435115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381749.

The product of its digits is 1200, while the sum is 25.

The square root of 1221435115 is about 34949.0359666758. The cubic root of 1221435115 is about 1068.9485449449.

Adding to 1221435115 its reverse (5115341221), we get a palindrome (6336776336).

The spelling of 1221435115 in words is "one billion, two hundred twenty-one million, four hundred thirty-five thousand, one hundred fifteen".