211657042 has 4 divisors (see below), whose sum is σ = 317485566. Its totient is φ = 105828520.

The previous prime is 211656943. The next prime is 211657049. The reversal of 211657042 is 240756112.

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

It can be written as a sum of positive squares in only one way, i.e., 127035441 + 84621601 = 11271^2 + 9199^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211657042.

It is not an unprimeable number, because it can be changed into a prime (211657049) by changing a digit.

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 as a sum of consecutive naturals, namely, 52914259 + ... + 52914262.

Almost surely, 2^211657042 is an apocalyptic number.

211657042 is a deficient number, since it is larger than the sum of its proper divisors (105828524).

211657042 is a wasteful number, since it uses less digits than its factorization.

211657042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105828523.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 211657042 is about 14548.4377855493. The cubic root of 211657042 is about 595.9514865997.

The spelling of 211657042 in words is "two hundred eleven million, six hundred fifty-seven thousand, forty-two".