145350021 has 4 divisors (see below), whose sum is σ = 193800032. Its totient is φ = 96900012.

The previous prime is 145349989. The next prime is 145350061. The reversal of 145350021 is 120053541.

145350021 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 not a de Polignac number, because 145350021 - 2⁵ = 145349989 is a prime.

It is a super-2 number, since 2×145350021² = 42253257209400882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145350021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145350061) 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, 24225001 + ... + 24225006.

It is an arithmetic number, because the mean of its divisors is an integer number (48450008).

Almost surely, 2^145350021 is an apocalyptic number.

It is an amenable number.

145350021 is a deficient number, since it is larger than the sum of its proper divisors (48450011).

145350021 is an equidigital number, since it uses as much as digits as its factorization.

145350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48450010.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 145350021 is about 12056.1196493731. The cubic root of 145350021 is about 525.7811753931.

The spelling of 145350021 in words is "one hundred forty-five million, three hundred fifty thousand, twenty-one".