1235405342321 has 2 divisors, whose sum is σ = 1235405342322. Its totient is φ = 1235405342320.

The previous prime is 1235405342309. The next prime is 1235405342359. The reversal of 1235405342321 is 1232435045321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 800194655296 + 435210687025 = 894536^2 + 659705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235405342321 is a prime.

It is not a weakly prime, because it can be changed into another prime (1235405344321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617702671160 + 617702671161.

It is an arithmetic number, because the mean of its divisors is an integer number (617702671161).

Almost surely, 2^{1235405342321} is an apocalyptic number.

It is an amenable number.

1235405342321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235405342321 is an equidigital number, since it uses as much as digits as its factorization.

1235405342321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 1235405342321 in words is "one trillion, two hundred thirty-five billion, four hundred five million, three hundred forty-two thousand, three hundred twenty-one".