146221313521 has 4 divisors (see below), whose sum is σ = 146224027044. Its totient is φ = 146218600000.

The previous prime is 146221313431. The next prime is 146221313549. The reversal of 146221313521 is 125313122641.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6727280400 + 139494033121 = 82020^2 + 373489^2 .

It is a cyclic number.

It is not a de Polignac number, because 146221313521 - 2²⁷ = 146087095793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146228313521) 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, 1274260 + ... + 1384261.

It is an arithmetic number, because the mean of its divisors is an integer number (36556006761).

Almost surely, 2^146221313521 is an apocalyptic number.

It is an amenable number.

146221313521 is a deficient number, since it is larger than the sum of its proper divisors (2713523).

146221313521 is an equidigital number, since it uses as much as digits as its factorization.

146221313521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713522.

The product of its digits is 8640, while the sum is 31.

The spelling of 146221313521 in words is "one hundred forty-six billion, two hundred twenty-one million, three hundred thirteen thousand, five hundred twenty-one".