145543323421 has 4 divisors (see below), whose sum is σ = 146096720352. Its totient is φ = 144989926492.

The previous prime is 145543323413. The next prime is 145543323433. The reversal of 145543323421 is 124323345541.

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 145543323421 - 2³ = 145543323413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145543321421) 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, 276698071 + ... + 276698596.

It is an arithmetic number, because the mean of its divisors is an integer number (36524180088).

Almost surely, 2^145543323421 is an apocalyptic number.

It is an amenable number.

145543323421 is a deficient number, since it is larger than the sum of its proper divisors (553396931).

145543323421 is an equidigital number, since it uses as much as digits as its factorization.

145543323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553396930.

The product of its digits is 172800, while the sum is 37.

Adding to 145543323421 its reverse (124323345541), we get a palindrome (269866668962).

The spelling of 145543323421 in words is "one hundred forty-five billion, five hundred forty-three million, three hundred twenty-three thousand, four hundred twenty-one".