155421030 has 32 divisors (see below), whose sum is σ = 374141664. Its totient is φ = 41319936.

The previous prime is 155421001. The next prime is 155421103. The reversal of 155421030 is 30124551.

It is a junction number, because it is equal to n+sod(n) for n = 155420988 and 155421006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2424 + ... + 17796.

It is an arithmetic number, because the mean of its divisors is an integer number (11691927).

Almost surely, 2^155421030 is an apocalyptic number.

155421030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155421030 is an abundant number, since it is smaller than the sum of its proper divisors (218720634).

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

155421030 is a wasteful number, since it uses less digits than its factorization.

155421030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15720.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 155421030 is about 12466.7971027044. The cubic root of 155421030 is about 537.6544701155.

Adding to 155421030 its reverse (30124551), we get a palindrome (185545581).

The spelling of 155421030 in words is "one hundred fifty-five million, four hundred twenty-one thousand, thirty".