145140021 has 24 divisors (see below), whose sum is σ = 226289336. Its totient is φ = 89112960.

The previous prime is 145140019. The next prime is 145140049. The reversal of 145140021 is 120041541.

It can be written as a sum of positive squares in 4 ways, for example, as 202500 + 144937521 = 450^2 + 12039^2 .

It is not a de Polignac number, because 145140021 - 2¹ = 145140019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 145139976 and 145140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145140071) 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 23 ways as a sum of consecutive naturals, for example, 62151 + ... + 64443.

Almost surely, 2^145140021 is an apocalyptic number.

It is an amenable number.

145140021 is a deficient number, since it is larger than the sum of its proper divisors (81149315).

145140021 is a wasteful number, since it uses less digits than its factorization.

145140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853 (or 2850 counting only the distinct ones).

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

The square root of 145140021 is about 12047.4072314337. The cubic root of 145140021 is about 525.5278391964.

Adding to 145140021 its reverse (120041541), we get a palindrome (265181562).

The spelling of 145140021 in words is "one hundred forty-five million, one hundred forty thousand, twenty-one".