211994536 has 32 divisors (see below), whose sum is σ = 432016200. Its totient is φ = 96940800.

The previous prime is 211994521. The next prime is 211994543. The reversal of 211994536 is 635499112.

It can be written as a sum of positive squares in 4 ways, for example, as 131102500 + 80892036 = 11450^2 + 8994^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1986 + ... + 20686.

Almost surely, 2^211994536 is an apocalyptic number.

211994536 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211994536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216008100).

211994536 is an abundant number, since it is smaller than the sum of its proper divisors (220021664).

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

211994536 is a wasteful number, since it uses less digits than its factorization.

211994536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18829 (or 18825 counting only the distinct ones).

The product of its digits is 58320, while the sum is 40.

The square root of 211994536 is about 14560.0321428217. The cubic root of 211994536 is about 596.2680730311.

The spelling of 211994536 in words is "two hundred eleven million, nine hundred ninety-four thousand, five hundred thirty-six".