1221123319 has 8 divisors (see below), whose sum is σ = 1315418720. Its totient is φ = 1126879776.

The previous prime is 1221123317. The next prime is 1221123349. The reversal of 1221123319 is 9133211221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221123319 - 2¹ = 1221123317 is a prime.

It is a super-2 number, since 2×1221123319² = 2982284320411151522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221123293 and 1221123302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221123317) 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 7 ways as a sum of consecutive naturals, for example, 45862 + ... + 67420.

It is an arithmetic number, because the mean of its divisors is an integer number (164427340).

Almost surely, 2^1221123319 is an apocalyptic number.

1221123319 is a deficient number, since it is larger than the sum of its proper divisors (94295401).

1221123319 is a wasteful number, since it uses less digits than its factorization.

1221123319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25929.

The product of its digits is 648, while the sum is 25.

The square root of 1221123319 is about 34944.5749580675. The cubic root of 1221123319 is about 1068.8575802972.

The spelling of 1221123319 in words is "one billion, two hundred twenty-one million, one hundred twenty-three thousand, three hundred nineteen".