145001421 has 20 divisors (see below), whose sum is σ = 224079900. Its totient is φ = 93332736.

The previous prime is 145001413. The next prime is 145001429. The reversal of 145001421 is 124100541.

It is an interprime number because it is at equal distance from previous prime (145001413) and next prime (145001429).

It can be written as a sum of positive squares in 2 ways, for example, as 118592100 + 26409321 = 10890^2 + 5139^2 .

It is not a de Polignac number, because 145001421 - 2³ = 145001413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145001394 and 145001403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145001429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28516 + ... + 33213.

It is an arithmetic number, because the mean of its divisors is an integer number (11203995).

Almost surely, 2^145001421 is an apocalyptic number.

It is an amenable number.

145001421 is a deficient number, since it is larger than the sum of its proper divisors (79078479).

145001421 is an equidigital number, since it uses as much as digits as its factorization.

145001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61770 (or 61761 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 145001421 is about 12041.6535824612. The cubic root of 145001421 is about 525.3605034157.

Adding to 145001421 its reverse (124100541), we get a palindrome (269101962).

The spelling of 145001421 in words is "one hundred forty-five million, one thousand, four hundred twenty-one".