1221711689 has 8 divisors (see below), whose sum is σ = 1335150432. Its totient is φ = 1108668640.

The previous prime is 1221711653. The next prime is 1221711703. The reversal of 1221711689 is 9861171221.

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 1221711689 - 2¹² = 1221707593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221711389) 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, 92444 + ... + 104829.

It is an arithmetic number, because the mean of its divisors is an integer number (166893804).

Almost surely, 2^1221711689 is an apocalyptic number.

It is an amenable number.

1221711689 is a deficient number, since it is larger than the sum of its proper divisors (113438743).

1221711689 is a wasteful number, since it uses less digits than its factorization.

1221711689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197847.

The product of its digits is 12096, while the sum is 38.

The square root of 1221711689 is about 34952.9925614389. The cubic root of 1221711689 is about 1069.0292208262.

The spelling of 1221711689 in words is "one billion, two hundred twenty-one million, seven hundred eleven thousand, six hundred eighty-nine".