155241421 has 4 divisors (see below), whose sum is σ = 161991072. Its totient is φ = 148491772.

The previous prime is 155241407. The next prime is 155241431. The reversal of 155241421 is 124142551.

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.

It is not a de Polignac number, because 155241421 - 2⁵ = 155241389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155241431) 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, 3374791 + ... + 3374836.

It is an arithmetic number, because the mean of its divisors is an integer number (40497768).

Almost surely, 2^155241421 is an apocalyptic number.

It is an amenable number.

155241421 is a deficient number, since it is larger than the sum of its proper divisors (6749651).

155241421 is an equidigital number, since it uses as much as digits as its factorization.

155241421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749650.

The product of its digits is 1600, while the sum is 25.

The square root of 155241421 is about 12459.5915262098. The cubic root of 155241421 is about 537.4472806415.

Adding to 155241421 its reverse (124142551), we get a palindrome (279383972).

The spelling of 155241421 in words is "one hundred fifty-five million, two hundred forty-one thousand, four hundred twenty-one".