156211222 has 4 divisors (see below), whose sum is σ = 234316836. Its totient is φ = 78105610.

The previous prime is 156211199. The next prime is 156211241. The reversal of 156211222 is 222112651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222112651 = 61 ⋅3641191.

It is a junction number, because it is equal to n+sod(n) for n = 156211193 and 156211202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39052804 + ... + 39052807.

It is an arithmetic number, because the mean of its divisors is an integer number (58579209).

Almost surely, 2^156211222 is an apocalyptic number.

156211222 is a deficient number, since it is larger than the sum of its proper divisors (78105614).

156211222 is an equidigital number, since it uses as much as digits as its factorization.

156211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78105613.

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

The square root of 156211222 is about 12498.4487837491. The cubic root of 156211222 is about 538.5641116649.

Adding to 156211222 its reverse (222112651), we get a palindrome (378323873).

The spelling of 156211222 in words is "one hundred fifty-six million, two hundred eleven thousand, two hundred twenty-two".