1209476331221 has 2 divisors, whose sum is σ = 1209476331222. Its totient is φ = 1209476331220.

The previous prime is 1209476331187. The next prime is 1209476331227. The reversal of 1209476331221 is 1221336749021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207770228196 + 1706103025 = 1098986^2 + 41305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209476331221 - 2⁶ = 1209476331157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1209476331227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604738165610 + 604738165611.

It is an arithmetic number, because the mean of its divisors is an integer number (604738165611).

Almost surely, 2^{1209476331221} is an apocalyptic number.

It is an amenable number.

1209476331221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209476331221 is an equidigital number, since it uses as much as digits as its factorization.

1209476331221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 1209476331221 in words is "one trillion, two hundred nine billion, four hundred seventy-six million, three hundred thirty-one thousand, two hundred twenty-one".