211211242 has 16 divisors (see below), whose sum is σ = 347149152. Its totient is φ = 95579920.

The previous prime is 211211191. The next prime is 211211243. The reversal of 211211242 is 242112112.

It is a super-2 number, since 2×211211242² = 89220377494365128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211211243) 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, 16153 + ... + 26140.

It is an arithmetic number, because the mean of its divisors is an integer number (21696822).

Almost surely, 2^211211242 is an apocalyptic number.

211211242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211211242 is a deficient number, since it is larger than the sum of its proper divisors (135937910).

211211242 is a wasteful number, since it uses less digits than its factorization.

211211242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42533.

The product of its digits is 64, while the sum is 16.

The square root of 211211242 is about 14533.1084768538. The cubic root of 211211242 is about 595.5327873779.

Adding to 211211242 its reverse (242112112), we get a palindrome (453323354).

The spelling of 211211242 in words is "two hundred eleven million, two hundred eleven thousand, two hundred forty-two".