147721333921 has 4 divisors (see below), whose sum is σ = 168824381632. Its totient is φ = 126618286212.

The previous prime is 147721333919. The next prime is 147721333933. The reversal of 147721333921 is 129333127741.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129333127741 = 23 ⋅5623179467.

It is a cyclic number.

It is not a de Polignac number, because 147721333921 - 2¹ = 147721333919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (147721393921) 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, 10551523845 + ... + 10551523858.

It is an arithmetic number, because the mean of its divisors is an integer number (42206095408).

Almost surely, 2^147721333921 is an apocalyptic number.

It is an amenable number.

147721333921 is a deficient number, since it is larger than the sum of its proper divisors (21103047711).

147721333921 is an equidigital number, since it uses as much as digits as its factorization.

147721333921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21103047710.

The product of its digits is 190512, while the sum is 43.

The spelling of 147721333921 in words is "one hundred forty-seven billion, seven hundred twenty-one million, three hundred thirty-three thousand, nine hundred twenty-one".