1221102121229 has 2 divisors, whose sum is σ = 1221102121230. Its totient is φ = 1221102121228.

The previous prime is 1221102121219. The next prime is 1221102121249. The reversal of 1221102121229 is 9221212011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1172893332004 + 48208789225 = 1083002^2 + 219565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221102121229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221102121198 and 1221102121207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221102121219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551060614 + 610551060615.

It is an arithmetic number, because the mean of its divisors is an integer number (610551060615).

Almost surely, 2^{1221102121229} is an apocalyptic number.

It is an amenable number.

1221102121229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221102121229 is an equidigital number, since it uses as much as digits as its factorization.

1221102121229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 1221102121229 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty-nine".