1221835117 has 4 divisors (see below), whose sum is σ = 1225164736. Its totient is φ = 1218505500.

The previous prime is 1221835103. The next prime is 1221835151. The reversal of 1221835117 is 7115381221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7115381221 = 13 ⋅547337017.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221835117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221835177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1664259 + ... + 1664992.

It is an arithmetic number, because the mean of its divisors is an integer number (306291184).

Almost surely, 2^1221835117 is an apocalyptic number.

It is an amenable number.

1221835117 is a deficient number, since it is larger than the sum of its proper divisors (3329619).

1221835117 is an equidigital number, since it uses as much as digits as its factorization.

1221835117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3329618.

The product of its digits is 3360, while the sum is 31.

The square root of 1221835117 is about 34954.7581453513. The cubic root of 1221835117 is about 1069.0652205078.

The spelling of 1221835117 in words is "one billion, two hundred twenty-one million, eight hundred thirty-five thousand, one hundred seventeen".