149421 has 4 divisors (see below), whose sum is σ = 199232. Its totient is φ = 99612.

The previous prime is 149419. The next prime is 149423. The reversal of 149421 is 124941.

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: 124941 = 3 ⋅41647.

It is an interprime number because it is at equal distance from previous prime (149419) and next prime (149423).

It is not a de Polignac number, because 149421 - 2¹ = 149419 is a prime.

It is a D-number.

It is a Duffinian number.

149421 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149423) 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, 24901 + ... + 24906.

It is an arithmetic number, because the mean of its divisors is an integer number (49808).

2¹⁴⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

149421 is a deficient number, since it is larger than the sum of its proper divisors (49811).

149421 is an equidigital number, since it uses as much as digits as its factorization.

149421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49810.

The product of its digits is 288, while the sum is 21.

The square root of 149421 is about 386.5501261156. The cubic root of 149421 is about 53.0644759399.

The spelling of 149421 in words is "one hundred forty-nine thousand, four hundred twenty-one".