155243421 has 12 divisors (see below), whose sum is σ = 224714880. Its totient is φ = 103276680.

The previous prime is 155243419. The next prime is 155243423. The reversal of 155243421 is 124342551.

It is an interprime number because it is at equal distance from previous prime (155243419) and next prime (155243423).

It is not a de Polignac number, because 155243421 - 2¹ = 155243419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155243423) 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 11 ways as a sum of consecutive naturals, for example, 13695 + ... + 22316.

It is an arithmetic number, because the mean of its divisors is an integer number (18726240).

Almost surely, 2^155243421 is an apocalyptic number.

It is an amenable number.

155243421 is a deficient number, since it is larger than the sum of its proper divisors (69471459).

155243421 is a wasteful number, since it uses less digits than its factorization.

155243421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36496 (or 36493 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 155243421 is about 12459.6717854043. The cubic root of 155243421 is about 537.4495886379.

Adding to 155243421 its reverse (124342551), we get a palindrome (279585972).

The spelling of 155243421 in words is "one hundred fifty-five million, two hundred forty-three thousand, four hundred twenty-one".