146291839921 has 4 divisors (see below), whose sum is σ = 147273664500. Its totient is φ = 145310015344.

The previous prime is 146291839919. The next prime is 146291839931. The reversal of 146291839921 is 129938192641.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129938192641 = 557 ⋅233282213.

It can be written as a sum of positive squares in 2 ways, for example, as 4512480625 + 141779359296 = 67175^2 + 376536^2 .

It is a cyclic number.

It is not a de Polignac number, because 146291839921 - 2¹ = 146291839919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (146291839931) 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, 490912066 + ... + 490912363.

It is an arithmetic number, because the mean of its divisors is an integer number (36818416125).

Almost surely, 2^146291839921 is an apocalyptic number.

It is an amenable number.

146291839921 is a deficient number, since it is larger than the sum of its proper divisors (981824579).

146291839921 is an equidigital number, since it uses as much as digits as its factorization.

146291839921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981824578.

The product of its digits is 1679616, while the sum is 55.

The spelling of 146291839921 in words is "one hundred forty-six billion, two hundred ninety-one million, eight hundred thirty-nine thousand, nine hundred twenty-one".