211420042 has 4 divisors (see below), whose sum is σ = 317130066. Its totient is φ = 105710020.

The previous prime is 211420009. The next prime is 211420043. The reversal of 211420042 is 240024112.

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., 168766081 + 42653961 = 12991^2 + 6531^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211419998 and 211420025.

It is not an unprimeable number, because it can be changed into a prime (211420043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52855009 + ... + 52855012.

Almost surely, 2^211420042 is an apocalyptic number.

211420042 is a deficient number, since it is larger than the sum of its proper divisors (105710024).

211420042 is a wasteful number, since it uses less digits than its factorization.

211420042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105710023.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 211420042 is about 14540.2902997155. The cubic root of 211420042 is about 595.7289674225.

Adding to 211420042 its reverse (240024112), we get a palindrome (451444154).

The spelling of 211420042 in words is "two hundred eleven million, four hundred twenty thousand, forty-two".