1222007621 has 4 divisors (see below), whose sum is σ = 1255034892. Its totient is φ = 1188980352.

The previous prime is 1222007609. The next prime is 1222007623. The reversal of 1222007621 is 1267002221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534256996 + 687750625 = 23114^2 + 26225^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222007621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222007623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16513580 + ... + 16513653.

It is an arithmetic number, because the mean of its divisors is an integer number (313758723).

Almost surely, 2^1222007621 is an apocalyptic number.

It is an amenable number.

1222007621 is a deficient number, since it is larger than the sum of its proper divisors (33027271).

1222007621 is an equidigital number, since it uses as much as digits as its factorization.

1222007621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33027270.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1222007621 is about 34957.2255907130. The cubic root of 1222007621 is about 1069.1155299006.

Adding to 1222007621 its reverse (1267002221), we get a palindrome (2489009842).

The spelling of 1222007621 in words is "one billion, two hundred twenty-two million, seven thousand, six hundred twenty-one".