1221310019 has 8 divisors (see below), whose sum is σ = 1232554320. Its totient is φ = 1210115200.

The previous prime is 1221310001. The next prime is 1221310033. The reversal of 1221310019 is 9100131221.

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 1221310019 - 2¹⁶ = 1221244483 is a prime.

It is a super-2 number, since 2×1221310019² = 2983196325019560722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221310049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38159 + ... + 62439.

It is an arithmetic number, because the mean of its divisors is an integer number (154069290).

Almost surely, 2^1221310019 is an apocalyptic number.

1221310019 is a deficient number, since it is larger than the sum of its proper divisors (11244301).

1221310019 is a wasteful number, since it uses less digits than its factorization.

1221310019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24741.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1221310019 is about 34947.2462291380. The cubic root of 1221310019 is about 1068.9120507830.

The spelling of 1221310019 in words is "one billion, two hundred twenty-one million, three hundred ten thousand, nineteen".