211918530 has 32 divisors (see below), whose sum is σ = 510732288. Its totient is φ = 56275200.

The previous prime is 211918517. The next prime is 211918541. The reversal of 211918530 is 35819112.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 7426 + ... + 21885.

It is an arithmetic number, because the mean of its divisors is an integer number (15960384).

Almost surely, 2^211918530 is an apocalyptic number.

211918530 is an abundant number, since it is smaller than the sum of its proper divisors (298813758).

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

211918530 is a wasteful number, since it uses less digits than its factorization.

211918530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29562.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 211918530 is about 14557.4218184402. The cubic root of 211918530 is about 596.1968048917.

The spelling of 211918530 in words is "two hundred eleven million, nine hundred eighteen thousand, five hundred thirty".