155244421 has 8 divisors (see below), whose sum is σ = 163612800. Its totient is φ = 146895840.

The previous prime is 155244413. The next prime is 155244433. The reversal of 155244421 is 124442551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155244421 - 2³ = 155244413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155244421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155244521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12825 + ... + 21793.

It is an arithmetic number, because the mean of its divisors is an integer number (20451600).

Almost surely, 2^155244421 is an apocalyptic number.

It is an amenable number.

155244421 is a deficient number, since it is larger than the sum of its proper divisors (8368379).

155244421 is an equidigital number, since it uses as much as digits as its factorization.

155244421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9899.

The product of its digits is 6400, while the sum is 28.

The square root of 155244421 is about 12459.7119148077. The cubic root of 155244421 is about 537.4507426287.

Adding to 155244421 its reverse (124442551), we get a palindrome (279686972).

The spelling of 155244421 in words is "one hundred fifty-five million, two hundred forty-four thousand, four hundred twenty-one".