1612123154321 has 4 divisors (see below), whose sum is σ = 1649614390512. Its totient is φ = 1574631918132.

The previous prime is 1612123154309. The next prime is 1612123154359. The reversal of 1612123154321 is 1234513212161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1612123154321 - 2²² = 1612118960017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1612123154381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18745618031 + ... + 18745618116.

It is an arithmetic number, because the mean of its divisors is an integer number (412403597628).

Almost surely, 2^{1612123154321} is an apocalyptic number.

It is an amenable number.

1612123154321 is a deficient number, since it is larger than the sum of its proper divisors (37491236191).

1612123154321 is an equidigital number, since it uses as much as digits as its factorization.

1612123154321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37491236190.

The product of its digits is 8640, while the sum is 32.

Adding to 1612123154321 its reverse (1234513212161), we get a palindrome (2846636366482).

The spelling of 1612123154321 in words is "one trillion, six hundred twelve billion, one hundred twenty-three million, one hundred fifty-four thousand, three hundred twenty-one".