156221130 has 64 divisors (see below), whose sum is σ = 407796480. Its totient is φ = 38071296.

The previous prime is 156221113. The next prime is 156221159. The reversal of 156221130 is 31122651.

It is a junction number, because it is equal to n+sod(n) for n = 156221097 and 156221106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38226 + ... + 42114.

It is an arithmetic number, because the mean of its divisors is an integer number (6371820).

Almost surely, 2^156221130 is an apocalyptic number.

156221130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 156221130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203898240).

156221130 is an abundant number, since it is smaller than the sum of its proper divisors (251575350).

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

156221130 is a wasteful number, since it uses less digits than its factorization.

156221130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 156221130 is about 12498.8451466525. The cubic root of 156221130 is about 538.5754979156.

Adding to 156221130 its reverse (31122651), we get a palindrome (187343781).

The spelling of 156221130 in words is "one hundred fifty-six million, two hundred twenty-one thousand, one hundred thirty".