1221331212029 has 2 divisors, whose sum is σ = 1221331212030. Its totient is φ = 1221331212028.

The previous prime is 1221331211999. The next prime is 1221331212061. The reversal of 1221331212029 is 9202121331221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196394064804 + 24937147225 = 1093798^2 + 157915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221331212029 - 2⁸ = 1221331211773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221331211992 and 1221331212010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221331212529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610665606014 + 610665606015.

It is an arithmetic number, because the mean of its divisors is an integer number (610665606015).

Almost surely, 2^{1221331212029} is an apocalyptic number.

It is an amenable number.

1221331212029 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221331212029 is an equidigital number, since it uses as much as digits as its factorization.

1221331212029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 1221331212029 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, two hundred twelve thousand, twenty-nine".