156130221 has 32 divisors (see below), whose sum is σ = 229178880. Its totient is φ = 93968064.

The previous prime is 156130217. The next prime is 156130259. The reversal of 156130221 is 122031651.

It is not a de Polignac number, because 156130221 - 2² = 156130217 is a prime.

It is a super-3 number, since 3×156130221³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156130211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449770 + ... + 450116.

It is an arithmetic number, because the mean of its divisors is an integer number (7161840).

Almost surely, 2^156130221 is an apocalyptic number.

It is an amenable number.

156130221 is a deficient number, since it is larger than the sum of its proper divisors (73048659).

156130221 is a wasteful number, since it uses less digits than its factorization.

156130221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585.

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

The square root of 156130221 is about 12495.2079214393. The cubic root of 156130221 is about 538.4710074405.

Adding to 156130221 its reverse (122031651), we get a palindrome (278161872).

The spelling of 156130221 in words is "one hundred fifty-six million, one hundred thirty thousand, two hundred twenty-one".