1345123274721 has 16 divisors (see below), whose sum is σ = 1939401771264. Its totient is φ = 826041492224.

The previous prime is 1345123274699. The next prime is 1345123274723. The reversal of 1345123274721 is 1274723215431.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1345123274721 - 2²⁷ = 1344989056993 is a prime.

It is a super-2 number, since 2×1345123274721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1345123274723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280582350 + ... + 280587143.

It is an arithmetic number, because the mean of its divisors is an integer number (121212610704).

Almost surely, 2^{1345123274721} is an apocalyptic number.

It is an amenable number.

1345123274721 is a deficient number, since it is larger than the sum of its proper divisors (594278496543).

1345123274721 is a wasteful number, since it uses less digits than its factorization.

1345123274721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561169560.

The product of its digits is 282240, while the sum is 42.

The spelling of 1345123274721 in words is "one trillion, three hundred forty-five billion, one hundred twenty-three million, two hundred seventy-four thousand, seven hundred twenty-one".