1221670089 has 12 divisors (see below), whose sum is σ = 1782827956. Its totient is φ = 806049792.

The previous prime is 1221670069. The next prime is 1221670123. The reversal of 1221670089 is 9800761221.

It can be written as a sum of positive squares in 2 ways, for example, as 217857600 + 1003812489 = 14760^2 + 31683^2 .

It is not a de Polignac number, because 1221670089 - 2⁵ = 1221670057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221670019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 698824 + ... + 700569.

Almost surely, 2^1221670089 is an apocalyptic number.

It is an amenable number.

1221670089 is a deficient number, since it is larger than the sum of its proper divisors (561157867).

1221670089 is a wasteful number, since it uses less digits than its factorization.

1221670089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399496 (or 1399493 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1221670089 is about 34952.3974714182. The cubic root of 1221670089 is about 1069.0170869977.

The spelling of 1221670089 in words is "one billion, two hundred twenty-one million, six hundred seventy thousand, eighty-nine".