1221433429 has 2 divisors, whose sum is σ = 1221433430. Its totient is φ = 1221433428.

The previous prime is 1221433417. The next prime is 1221433453. The reversal of 1221433429 is 9243341221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151041329 + 70392100 = 33927^2 + 8390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221433429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221433429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221430429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610716714 + 610716715.

It is an arithmetic number, because the mean of its divisors is an integer number (610716715).

Almost surely, 2^1221433429 is an apocalyptic number.

It is an amenable number.

1221433429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221433429 is an equidigital number, since it uses as much as digits as its factorization.

1221433429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 1221433429 is about 34949.0118458305. The cubic root of 1221433429 is about 1068.9480531059.

The spelling of 1221433429 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, four hundred twenty-nine".