145712021 has 8 divisors (see below), whose sum is σ = 179337984. Its totient is φ = 115288560.

The previous prime is 145712011. The next prime is 145712023. The reversal of 145712021 is 120217541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145712021 - 2²⁶ = 78603157 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145712023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800525 + ... + 800706.

It is an arithmetic number, because the mean of its divisors is an integer number (22417248).

Almost surely, 2^145712021 is an apocalyptic number.

It is an amenable number.

145712021 is a deficient number, since it is larger than the sum of its proper divisors (33625963).

145712021 is a wasteful number, since it uses less digits than its factorization.

145712021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1601251.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 145712021 is about 12071.1234357039. The cubic root of 145712021 is about 526.2173064924.

Adding to 145712021 its reverse (120217541), we get a palindrome (265929562).

The spelling of 145712021 in words is "one hundred forty-five million, seven hundred twelve thousand, twenty-one".