1221132415 has 4 divisors (see below), whose sum is σ = 1465358904. Its totient is φ = 976905928.

The previous prime is 1221132401. The next prime is 1221132433. The reversal of 1221132415 is 5142311221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221132415 - 2¹⁷ = 1221001343 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 122113237 + ... + 122113246.

It is an arithmetic number, because the mean of its divisors is an integer number (366339726).

Almost surely, 2^1221132415 is an apocalyptic number.

1221132415 is a deficient number, since it is larger than the sum of its proper divisors (244226489).

1221132415 is an equidigital number, since it uses as much as digits as its factorization.

1221132415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244226488.

The product of its digits is 480, while the sum is 22.

The square root of 1221132415 is about 34944.7051067826. The cubic root of 1221132415 is about 1068.8602342209.

Adding to 1221132415 its reverse (5142311221), we get a palindrome (6363443636).

The spelling of 1221132415 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, four hundred fifteen".