1221221313229 has 8 divisors (see below), whose sum is σ = 1293154106040. Its totient is φ = 1149299214336.

The previous prime is 1221221313197. The next prime is 1221221313239. The reversal of 1221221313229 is 9223131221221.

It can be written as a sum of positive squares in 4 ways, for example, as 557265236004 + 663956077225 = 746502^2 + 814835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221221313229 - 2⁵ = 1221221313197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221221313229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221221313239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2437764 + ... + 2895709.

It is an arithmetic number, because the mean of its divisors is an integer number (161644263255).

Almost surely, 2^{1221221313229} is an apocalyptic number.

It is an amenable number.

1221221313229 is a deficient number, since it is larger than the sum of its proper divisors (71932792811).

1221221313229 is a wasteful number, since it uses less digits than its factorization.

1221221313229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346959.

The product of its digits is 5184, while the sum is 31.

The spelling of 1221221313229 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, three hundred thirteen thousand, two hundred twenty-nine".