211630380 has 96 divisors (see below), whose sum is σ = 655483584. Its totient is φ = 50678784.

The previous prime is 211630361. The next prime is 211630409. The reversal of 211630380 is 83036112.

211630380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 211630380.

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, 25194 + ... + 32526.

It is an arithmetic number, because the mean of its divisors is an integer number (6827954).

Almost surely, 2^211630380 is an apocalyptic number.

211630380 is a gapful number since it is divisible by the number (20) 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 211630380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327741792).

211630380 is an abundant number, since it is smaller than the sum of its proper divisors (443853204).

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

211630380 is a wasteful number, since it uses less digits than its factorization.

211630380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7395 (or 7393 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 211630380 is about 14547.5214383757. The cubic root of 211630380 is about 595.9264619566.

Adding to 211630380 its reverse (83036112), we get a palindrome (294666492).

The spelling of 211630380 in words is "two hundred eleven million, six hundred thirty thousand, three hundred eighty".