146210021 has 4 divisors (see below), whose sum is σ = 148212972. Its totient is φ = 144207072.

The previous prime is 146209993. The next prime is 146210027. The reversal of 146210021 is 120012641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120012641 = 7 ⋅17144663.

It can be written as a sum of positive squares in 2 ways, for example, as 123988225 + 22221796 = 11135^2 + 4714^2 .

It is a cyclic number.

It is not a de Polignac number, because 146210021 - 2⁶ = 146209957 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 (146210027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001366 + ... + 1001511.

It is an arithmetic number, because the mean of its divisors is an integer number (37053243).

Almost surely, 2^146210021 is an apocalyptic number.

It is an amenable number.

146210021 is a deficient number, since it is larger than the sum of its proper divisors (2002951).

146210021 is an equidigital number, since it uses as much as digits as its factorization.

146210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002950.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 146210021 is about 12091.7335812529. The cubic root of 146210021 is about 526.8161091608.

Adding to 146210021 its reverse (120012641), we get a palindrome (266222662).

The spelling of 146210021 in words is "one hundred forty-six million, two hundred ten thousand, twenty-one".