155021120 has 56 divisors (see below), whose sum is σ = 379149864. Its totient is φ = 60327936.

The previous prime is 155021107. The next prime is 155021159. The reversal of 155021120 is 21120551.

155021120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 77299264 + 77721856 = 8792^2 + 8816^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5294 + ... + 18386.

Almost surely, 2^155021120 is an apocalyptic number.

155021120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189574932).

155021120 is an abundant number, since it is smaller than the sum of its proper divisors (224128744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155021120 is a wasteful number, since it uses less digits than its factorization.

155021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13147 (or 13137 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 155021120 is about 12450.7477687085. The cubic root of 155021120 is about 537.1929322348.

Adding to 155021120 its reverse (21120551), we get a palindrome (176141671).

The spelling of 155021120 in words is "one hundred fifty-five million, twenty-one thousand, one hundred twenty".