212122155 has 32 divisors (see below), whose sum is σ = 392256000. Its totient is φ = 95876352.

The previous prime is 212122129. The next prime is 212122177. The reversal of 212122155 is 551221212.

212122155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212122155 - 2⁶ = 212122091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2005 + ... + 20694.

It is an arithmetic number, because the mean of its divisors is an integer number (12258000).

Almost surely, 2^212122155 is an apocalyptic number.

212122155 is a deficient number, since it is larger than the sum of its proper divisors (180133845).

212122155 is a wasteful number, since it uses less digits than its factorization.

212122155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22803.

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

The square root of 212122155 is about 14564.4139943906. The cubic root of 212122155 is about 596.3876985526.

Adding to 212122155 its reverse (551221212), we get a palindrome (763343367).

The spelling of 212122155 in words is "two hundred twelve million, one hundred twenty-two thousand, one hundred fifty-five".