155212211 has 16 divisors (see below), whose sum is σ = 201927168. Its totient is φ = 115684800.

The previous prime is 155212207. The next prime is 155212217. The reversal of 155212211 is 112212551.

It is not a de Polignac number, because 155212211 - 2² = 155212207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155212217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42050 + ... + 45591.

It is an arithmetic number, because the mean of its divisors is an integer number (12620448).

Almost surely, 2^155212211 is an apocalyptic number.

155212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155212211 is a deficient number, since it is larger than the sum of its proper divisors (46714957).

155212211 is a wasteful number, since it uses less digits than its factorization.

155212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87682.

The product of its digits is 200, while the sum is 20.

The square root of 155212211 is about 12458.4192817548. The cubic root of 155212211 is about 537.4135700942.

Adding to 155212211 its reverse (112212551), we get a palindrome (267424762).

The spelling of 155212211 in words is "one hundred fifty-five million, two hundred twelve thousand, two hundred eleven".