1221433432253 has 2 divisors, whose sum is σ = 1221433432254. Its totient is φ = 1221433432252.

The previous prime is 1221433432231. The next prime is 1221433432277. The reversal of 1221433432253 is 3522343341221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1105099230169 + 116334202084 = 1051237^2 + 341078^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221433432253 - 2⁶ = 1221433432189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221433432213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610716716126 + 610716716127.

It is an arithmetic number, because the mean of its divisors is an integer number (610716716127).

Almost surely, 2^{1221433432253} is an apocalyptic number.

It is an amenable number.

1221433432253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221433432253 is an equidigital number, since it uses as much as digits as its factorization.

1221433432253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 35.

Adding to 1221433432253 its reverse (3522343341221), we get a palindrome (4743776773474).

The spelling of 1221433432253 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-three million, four hundred thirty-two thousand, two hundred fifty-three".