145460021 has 4 divisors (see below), whose sum is σ = 166240032. Its totient is φ = 124680012.

The previous prime is 145460009. The next prime is 145460023. The reversal of 145460021 is 120064541.

145460021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 145460021 - 2¹⁴ = 145443637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145460023) 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, 10389995 + ... + 10390008.

It is an arithmetic number, because the mean of its divisors is an integer number (41560008).

Almost surely, 2^145460021 is an apocalyptic number.

It is an amenable number.

145460021 is a deficient number, since it is larger than the sum of its proper divisors (20780011).

145460021 is an equidigital number, since it uses as much as digits as its factorization.

145460021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20780010.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 145460021 is about 12060.6807850967. The cubic root of 145460021 is about 525.9137779321.

The spelling of 145460021 in words is "one hundred forty-five million, four hundred sixty thousand, twenty-one".