1204140221 has 2 divisors, whose sum is σ = 1204140222. Its totient is φ = 1204140220.

The previous prime is 1204140167. The next prime is 1204140269. The reversal of 1204140221 is 1220414021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191216196 + 12924025 = 34514^2 + 3595^2 .

It is an emirp because it is prime and its reverse (1220414021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1204140221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1204140221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204040221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602070110 + 602070111.

It is an arithmetic number, because the mean of its divisors is an integer number (602070111).

Almost surely, 2^1204140221 is an apocalyptic number.

It is an amenable number.

1204140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204140221 is an equidigital number, since it uses as much as digits as its factorization.

1204140221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1204140221 is about 34700.7236379877. The cubic root of 1204140221 is about 1063.8792889445.

Adding to 1204140221 its reverse (1220414021), we get a palindrome (2424554242).

The spelling of 1204140221 in words is "one billion, two hundred four million, one hundred forty thousand, two hundred twenty-one".