1221020130329 has 2 divisors, whose sum is σ = 1221020130330. Its totient is φ = 1221020130328.

The previous prime is 1221020130301. The next prime is 1221020130409. The reversal of 1221020130329 is 9230310201221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148009388304 + 73010742025 = 1071452^2 + 270205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221020130329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221020130298 and 1221020130307.

It is not a weakly prime, because it can be changed into another prime (1221020130529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610510065164 + 610510065165.

It is an arithmetic number, because the mean of its divisors is an integer number (610510065165).

Almost surely, 2^{1221020130329} is an apocalyptic number.

It is an amenable number.

1221020130329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221020130329 is an equidigital number, since it uses as much as digits as its factorization.

1221020130329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 1221020130329 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred thirty thousand, three hundred twenty-nine".