211131426 has 64 divisors (see below), whose sum is σ = 486881280. Its totient is φ = 60432960.

The previous prime is 211131413. The next prime is 211131451. The reversal of 211131426 is 624131112.

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, 88785 + ... + 91131.

It is an arithmetic number, because the mean of its divisors is an integer number (7607520).

Almost surely, 2^211131426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211131426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243440640).

211131426 is an abundant number, since it is smaller than the sum of its proper divisors (275749854).

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

211131426 is a wasteful number, since it uses less digits than its factorization.

211131426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2439.

The product of its digits is 288, while the sum is 21.

The square root of 211131426 is about 14530.3622115899. The cubic root of 211131426 is about 595.4577613309.

Adding to 211131426 its reverse (624131112), we get a palindrome (835262538).

The spelling of 211131426 in words is "two hundred eleven million, one hundred thirty-one thousand, four hundred twenty-six".