154121421 has 4 divisors (see below), whose sum is σ = 205495232. Its totient is φ = 102747612.

The previous prime is 154121381. The next prime is 154121437. The reversal of 154121421 is 124121451.

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: 124121451 = 3 ⋅41373817.

It is not a de Polignac number, because 154121421 - 2¹³ = 154113229 is a prime.

It is a super-2 number, since 2×154121421² = 47506824822118482, 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 (154125421) 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, 25686901 + ... + 25686906.

It is an arithmetic number, because the mean of its divisors is an integer number (51373808).

Almost surely, 2^154121421 is an apocalyptic number.

It is an amenable number.

154121421 is a deficient number, since it is larger than the sum of its proper divisors (51373811).

154121421 is an equidigital number, since it uses as much as digits as its factorization.

154121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51373810.

The product of its digits is 320, while the sum is 21.

The square root of 154121421 is about 12414.5648735669. The cubic root of 154121421 is about 536.1516763238.

Adding to 154121421 its reverse (124121451), we get a palindrome (278242872).

The spelling of 154121421 in words is "one hundred fifty-four million, one hundred twenty-one thousand, four hundred twenty-one".