146990021 has 4 divisors (see below), whose sum is σ = 147049344. Its totient is φ = 146930700.

The previous prime is 146989993. The next prime is 146990057. The reversal of 146990021 is 120099641.

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: 120099641 = 2441 ⋅49201.

It is a cyclic number.

It is not a de Polignac number, because 146990021 - 2¹⁴ = 146973637 is a prime.

It is a super-3 number, since 3×146990021³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 146990021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (146990071) 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, 25775 + ... + 30956.

It is an arithmetic number, because the mean of its divisors is an integer number (36762336).

Almost surely, 2^146990021 is an apocalyptic number.

It is an amenable number.

146990021 is a deficient number, since it is larger than the sum of its proper divisors (59323).

146990021 is an equidigital number, since it uses as much as digits as its factorization.

146990021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59322.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 146990021 is about 12123.9441189738. The cubic root of 146990021 is about 527.7512662320.

The spelling of 146990021 in words is "one hundred forty-six million, nine hundred ninety thousand, twenty-one".