145332021 has 16 divisors (see below), whose sum is σ = 200828160. Its totient is φ = 93374400.

The previous prime is 145332013. The next prime is 145332023. The reversal of 145332021 is 120233541.

145332021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145332021 - 2³ = 145332013 is a prime.

It is a super-2 number, since 2×145332021² = 42242792655888882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145332023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59796 + ... + 62178.

It is an arithmetic number, because the mean of its divisors is an integer number (12551760).

Almost surely, 2^145332021 is an apocalyptic number.

It is an amenable number.

145332021 is a deficient number, since it is larger than the sum of its proper divisors (55496139).

145332021 is a wasteful number, since it uses less digits than its factorization.

145332021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 145332021 is about 12055.3731174112. The cubic root of 145332021 is about 525.7594704270.

Adding to 145332021 its reverse (120233541), we get a palindrome (265565562).

The spelling of 145332021 in words is "one hundred forty-five million, three hundred thirty-two thousand, twenty-one".