154421 has 4 divisors (see below), whose sum is σ = 155232. Its totient is φ = 153612.

The previous prime is 154417. The next prime is 154423. The reversal of 154421 is 124451.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124451 = 97 ⋅1283.

It is a cyclic number.

It is not a de Polignac number, because 154421 - 2² = 154417 is a prime.

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 154421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154423) 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, 56 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (38808).

2¹⁵⁴⁴²¹ is an apocalyptic number.

It is an amenable number.

154421 is a deficient number, since it is larger than the sum of its proper divisors (811).

154421 is an equidigital number, since it uses as much as digits as its factorization.

154421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810.

The product of its digits is 160, while the sum is 17.

The square root of 154421 is about 392.9643749756. The cubic root of 154421 is about 53.6498839455.

Adding to 154421 its reverse (124451), we get a palindrome (278872).

It can be divided in two parts, 154 and 421, that added together give a palindrome (575).

The spelling of 154421 in words is "one hundred fifty-four thousand, four hundred twenty-one".