147238021 has 4 divisors (see below), whose sum is σ = 168272032. Its totient is φ = 126204012.

The previous prime is 147238009. The next prime is 147238043. The reversal of 147238021 is 120832741.

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 147238021 - 2⁵ = 147237989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147238001) 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, 10516995 + ... + 10517008.

It is an arithmetic number, because the mean of its divisors is an integer number (42068008).

Almost surely, 2^147238021 is an apocalyptic number.

It is an amenable number.

147238021 is a deficient number, since it is larger than the sum of its proper divisors (21034011).

147238021 is an equidigital number, since it uses as much as digits as its factorization.

147238021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21034010.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 147238021 is about 12134.1675033766. The cubic root of 147238021 is about 528.0479049070.

It can be divided in two parts, 1472 and 38021, that added together give a palindrome (39493).

The spelling of 147238021 in words is "one hundred forty-seven million, two hundred thirty-eight thousand, twenty-one".