1221320404229 has 2 divisors, whose sum is σ = 1221320404230. Its totient is φ = 1221320404228.

The previous prime is 1221320404211. The next prime is 1221320404303. The reversal of 1221320404229 is 9224040231221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 726832977025 + 494487427204 = 852545^2 + 703198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221320404229 is a prime.

It is a super-2 number, since 2×1221320404229² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221320404195 and 1221320404204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221320400229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610660202114 + 610660202115.

It is an arithmetic number, because the mean of its divisors is an integer number (610660202115).

Almost surely, 2^{1221320404229} is an apocalyptic number.

It is an amenable number.

1221320404229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221320404229 is an equidigital number, since it uses as much as digits as its factorization.

1221320404229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 1221320404229 in words is "one trillion, two hundred twenty-one billion, three hundred twenty million, four hundred four thousand, two hundred twenty-nine".