1221704893 has 4 divisors (see below), whose sum is σ = 1228530240. Its totient is φ = 1214879548.

The previous prime is 1221704873. The next prime is 1221704909. The reversal of 1221704893 is 3984071221.

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 not a de Polignac number, because 1221704893 - 2⁹ = 1221704381 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 (1221704873) 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, 3412405 + ... + 3412762.

It is an arithmetic number, because the mean of its divisors is an integer number (307132560).

Almost surely, 2^1221704893 is an apocalyptic number.

It is an amenable number.

1221704893 is a deficient number, since it is larger than the sum of its proper divisors (6825347).

1221704893 is an equidigital number, since it uses as much as digits as its factorization.

1221704893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6825346.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1221704893 is about 34952.8953450211. The cubic root of 1221704893 is about 1069.0272385974.

The spelling of 1221704893 in words is "one billion, two hundred twenty-one million, seven hundred four thousand, eight hundred ninety-three".