1221210202229 has 2 divisors, whose sum is σ = 1221210202230. Its totient is φ = 1221210202228.

The previous prime is 1221210202169. The next prime is 1221210202253. The reversal of 1221210202229 is 9222020121221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787120291204 + 434089911025 = 887198^2 + 658855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221210202229 - 2¹⁶ = 1221210136693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221210202198 and 1221210202207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221210202129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610605101114 + 610605101115.

It is an arithmetic number, because the mean of its divisors is an integer number (610605101115).

Almost surely, 2^{1221210202229} is an apocalyptic number.

It is an amenable number.

1221210202229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221210202229 is an equidigital number, since it uses as much as digits as its factorization.

1221210202229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1221210202229 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred two thousand, two hundred twenty-nine".