146000021 has 4 divisors (see below), whose sum is σ = 152347872. Its totient is φ = 139652172.

The previous prime is 146000017. The next prime is 146000059. The reversal of 146000021 is 120000641.

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: 120000641 = 3947 ⋅30403.

It is a cyclic number.

It is not a de Polignac number, because 146000021 - 2² = 146000017 is a prime.

It is a super-2 number, since 2×146000021² = 42632012264000882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146000821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3173891 + ... + 3173936.

It is an arithmetic number, because the mean of its divisors is an integer number (38086968).

Almost surely, 2^146000021 is an apocalyptic number.

It is an amenable number.

146000021 is a deficient number, since it is larger than the sum of its proper divisors (6347851).

146000021 is an equidigital number, since it uses as much as digits as its factorization.

146000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347850.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 146000021 is about 12083.0468425807. The cubic root of 146000021 is about 526.5637680633.

Adding to 146000021 its reverse (120000641), we get a palindrome (266000662).

The spelling of 146000021 in words is "one hundred forty-six million, twenty-one", and thus it is an aban number.