155222211 has 4 divisors (see below), whose sum is σ = 206962952. Its totient is φ = 103481472.

The previous prime is 155222173. The next prime is 155222237. The reversal of 155222211 is 112222551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 155222211 - 2⁷ = 155222083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155222251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25870366 + ... + 25870371.

It is an arithmetic number, because the mean of its divisors is an integer number (51740738).

Almost surely, 2^155222211 is an apocalyptic number.

155222211 is a deficient number, since it is larger than the sum of its proper divisors (51740741).

155222211 is an equidigital number, since it uses as much as digits as its factorization.

155222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51740740.

The product of its digits is 400, while the sum is 21.

The square root of 155222211 is about 12458.8206103146. The cubic root of 155222211 is about 537.4251113259.

Adding to 155222211 its reverse (112222551), we get a palindrome (267444762).

The spelling of 155222211 in words is "one hundred fifty-five million, two hundred twenty-two thousand, two hundred eleven".