145466021 has 2 divisors, whose sum is σ = 145466022. Its totient is φ = 145466020.

The previous prime is 145465997. The next prime is 145466063. The reversal of 145466021 is 120664541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131997121 + 13468900 = 11489^2 + 3670^2 .

It is an emirp because it is prime and its reverse (120664541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145466021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145466221) 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 as a sum of consecutive naturals, namely, 72733010 + 72733011.

It is an arithmetic number, because the mean of its divisors is an integer number (72733011).

Almost surely, 2^145466021 is an apocalyptic number.

It is an amenable number.

145466021 is a deficient number, since it is larger than the sum of its proper divisors (1).

145466021 is an equidigital number, since it uses as much as digits as its factorization.

145466021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 145466021 is about 12060.9295247091. The cubic root of 145466021 is about 525.9210088749.

The spelling of 145466021 in words is "one hundred forty-five million, four hundred sixty-six thousand, twenty-one".