147307821 has 4 divisors (see below), whose sum is σ = 196410432. Its totient is φ = 98205212.

The previous prime is 147307813. The next prime is 147307843. The reversal of 147307821 is 128703741.

It is a happy number.

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: 128703741 = 3 ⋅42901247.

It is a cyclic number.

It is not a de Polignac number, because 147307821 - 2³ = 147307813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147307021) 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, 24551301 + ... + 24551306.

It is an arithmetic number, because the mean of its divisors is an integer number (49102608).

Almost surely, 2^147307821 is an apocalyptic number.

It is an amenable number.

147307821 is a deficient number, since it is larger than the sum of its proper divisors (49102611).

147307821 is an equidigital number, since it uses as much as digits as its factorization.

147307821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49102610.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 147307821 is about 12137.0433384742. The cubic root of 147307821 is about 528.1313342657.

The spelling of 147307821 in words is "one hundred forty-seven million, three hundred seven thousand, eight hundred twenty-one".