211166142 has 32 divisors (see below), whose sum is σ = 461617920. Its totient is φ = 63865920.

The previous prime is 211166093. The next prime is 211166143. The reversal of 211166142 is 241661112.

It is a happy number.

It is a super-2 number, since 2×211166142² = 89182279054328328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211166143) 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, 34743 + ... + 40365.

It is an arithmetic number, because the mean of its divisors is an integer number (14425560).

Almost surely, 2^211166142 is an apocalyptic number.

211166142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

211166142 is an abundant number, since it is smaller than the sum of its proper divisors (250451778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211166142 is a wasteful number, since it uses less digits than its factorization.

211166142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6208.

The product of its digits is 576, while the sum is 24.

The square root of 211166142 is about 14531.5567645039. The cubic root of 211166142 is about 595.4903962621.

The spelling of 211166142 in words is "two hundred eleven million, one hundred sixty-six thousand, one hundred forty-two".