211530542 has 4 divisors (see below), whose sum is σ = 317295816. Its totient is φ = 105765270.

The previous prime is 211530511. The next prime is 211530551. The reversal of 211530542 is 245035112.

211530542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52882634 + ... + 52882637.

It is an arithmetic number, because the mean of its divisors is an integer number (79323954).

Almost surely, 2^211530542 is an apocalyptic number.

211530542 is a deficient number, since it is larger than the sum of its proper divisors (105765274).

211530542 is a wasteful number, since it uses less digits than its factorization.

211530542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105765273.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 211530542 is about 14544.0895899331. The cubic root of 211530542 is about 595.8327364962.

Adding to 211530542 its reverse (245035112), we get a palindrome (456565654).

The spelling of 211530542 in words is "two hundred eleven million, five hundred thirty thousand, five hundred forty-two".