145531021404 has 12 divisors (see below), whose sum is σ = 339572383304. Its totient is φ = 48510340464.

The previous prime is 145531021403. The next prime is 145531021439. The reversal of 145531021404 is 404120135541.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×145531021404² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145531021403) 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, 6063792547 + ... + 6063792570.

Almost surely, 2^145531021404 is an apocalyptic number.

It is an amenable number.

145531021404 is an abundant number, since it is smaller than the sum of its proper divisors (194041361900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145531021404 is a wasteful number, since it uses less digits than its factorization.

145531021404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127585124 (or 12127585122 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 145531021404 its reverse (404120135541), we get a palindrome (549651156945).

The spelling of 145531021404 in words is "one hundred forty-five billion, five hundred thirty-one million, twenty-one thousand, four hundred four".