1323155354221 has 2 divisors, whose sum is σ = 1323155354222. Its totient is φ = 1323155354220.

The previous prime is 1323155354201. The next prime is 1323155354243. The reversal of 1323155354221 is 1224535513231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 875373556996 + 447781797225 = 935614^2 + 669165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323155354221 - 2²⁹ = 1322618483309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323155354201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661577677110 + 661577677111.

It is an arithmetic number, because the mean of its divisors is an integer number (661577677111).

Almost surely, 2^{1323155354221} is an apocalyptic number.

It is an amenable number.

1323155354221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323155354221 is an equidigital number, since it uses as much as digits as its factorization.

1323155354221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 37.

The spelling of 1323155354221 in words is "one trillion, three hundred twenty-three billion, one hundred fifty-five million, three hundred fifty-four thousand, two hundred twenty-one".