211530442 has 12 divisors (see below), whose sum is σ = 321842898. Its totient is φ = 104270600.

The previous prime is 211530427. The next prime is 211530481. The reversal of 211530442 is 244035112.

It can be written as a sum of positive squares in only one way, i.e., 180069561 + 31460881 = 13419^2 + 5609^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409 + ... + 20572.

Almost surely, 2^211530442 is an apocalyptic number.

211530442 is a deficient number, since it is larger than the sum of its proper divisors (110312456).

211530442 is an equidigital number, since it uses as much as digits as its factorization.

211530442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21125 (or 21054 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 211530442 is about 14544.0861521101. The cubic root of 211530442 is about 595.8326426038.

Adding to 211530442 its reverse (244035112), we get a palindrome (455565554).

The spelling of 211530442 in words is "two hundred eleven million, five hundred thirty thousand, four hundred forty-two".