1216220293 has 4 divisors (see below), whose sum is σ = 1218350848. Its totient is φ = 1214089740.

The previous prime is 1216220281. The next prime is 1216220297. The reversal of 1216220293 is 3920226121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216220293 is a prime.

It is a super-2 number, since 2×1216220293² = 2958383602210011698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216220297) by changing a digit.

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, 1064421 + ... + 1065562.

It is an arithmetic number, because the mean of its divisors is an integer number (304587712).

Almost surely, 2^1216220293 is an apocalyptic number.

It is an amenable number.

1216220293 is a deficient number, since it is larger than the sum of its proper divisors (2130555).

1216220293 is an equidigital number, since it uses as much as digits as its factorization.

1216220293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130554.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1216220293 is about 34874.3500727971. The cubic root of 1216220293 is about 1067.4251106632.

The spelling of 1216220293 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, two hundred ninety-three".