1221443300129 has 4 divisors (see below), whose sum is σ = 1315400477076. Its totient is φ = 1127486123184.

The previous prime is 1221443300111. The next prime is 1221443300131. The reversal of 1221443300129 is 9210033441221.

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 682317300625 + 539125999504 = 826025^2 + 734252^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221443300129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221443300095 and 1221443300104.

It is not an unprimeable number, because it can be changed into a prime (1221443300029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46978588454 + ... + 46978588479.

It is an arithmetic number, because the mean of its divisors is an integer number (328850119269).

Almost surely, 2^{1221443300129} is an apocalyptic number.

It is an amenable number.

1221443300129 is a deficient number, since it is larger than the sum of its proper divisors (93957176947).

1221443300129 is an equidigital number, since it uses as much as digits as its factorization.

1221443300129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93957176946.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 1221443300129 in words is "one trillion, two hundred twenty-one billion, four hundred forty-three million, three hundred thousand, one hundred twenty-nine".