145243811321 has 4 divisors (see below), whose sum is σ = 165992927232. Its totient is φ = 124494695412.

The previous prime is 145243811249. The next prime is 145243811329. The reversal of 145243811321 is 123118342541.

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 145243811321 - 2¹⁸ = 145243549177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145243811329) 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, 10374557945 + ... + 10374557958.

It is an arithmetic number, because the mean of its divisors is an integer number (41498231808).

Almost surely, 2^145243811321 is an apocalyptic number.

It is an amenable number.

145243811321 is a deficient number, since it is larger than the sum of its proper divisors (20749115911).

145243811321 is an equidigital number, since it uses as much as digits as its factorization.

145243811321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20749115910.

The product of its digits is 23040, while the sum is 35.

The spelling of 145243811321 in words is "one hundred forty-five billion, two hundred forty-three million, eight hundred eleven thousand, three hundred twenty-one".