1345122331621 has 2 divisors, whose sum is σ = 1345122331622. Its totient is φ = 1345122331620.

The previous prime is 1345122331601. The next prime is 1345122331649. The reversal of 1345122331621 is 1261332215431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1189342924900 + 155779406721 = 1090570^2 + 394689^2 .

It is an emirp because it is prime and its reverse (1261332215431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1345122331621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345122331601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672561165810 + 672561165811.

It is an arithmetic number, because the mean of its divisors is an integer number (672561165811).

Almost surely, 2^{1345122331621} is an apocalyptic number.

It is an amenable number.

1345122331621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345122331621 is an equidigital number, since it uses as much as digits as its factorization.

1345122331621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The spelling of 1345122331621 in words is "one trillion, three hundred forty-five billion, one hundred twenty-two million, three hundred thirty-one thousand, six hundred twenty-one".