156122221 has 8 divisors (see below), whose sum is σ = 164622080. Its totient is φ = 147650688.

The previous prime is 156122191. The next prime is 156122257. The reversal of 156122221 is 122221651.

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

It is a cyclic number.

It is not a de Polignac number, because 156122221 - 2⁹ = 156121709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 156122192 and 156122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156120221) 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, 4765 + ... + 18301.

It is an arithmetic number, because the mean of its divisors is an integer number (20577760).

Almost surely, 2^156122221 is an apocalyptic number.

It is an amenable number.

156122221 is a deficient number, since it is larger than the sum of its proper divisors (8499859).

156122221 is a wasteful number, since it uses less digits than its factorization.

156122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14163.

The product of its digits is 480, while the sum is 22.

The square root of 156122221 is about 12494.8877946142. The cubic root of 156122221 is about 538.4618103280.

Adding to 156122221 its reverse (122221651), we get a palindrome (278343872).

The spelling of 156122221 in words is "one hundred fifty-six million, one hundred twenty-two thousand, two hundred twenty-one".