211510042 has 4 divisors (see below), whose sum is σ = 317265066. Its totient is φ = 105755020.

The previous prime is 211510037. The next prime is 211510043. The reversal of 211510042 is 240015112.

211510042 is digitally balanced in base 2, 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 can be written as a sum of positive squares in only one way, i.e., 176119441 + 35390601 = 13271^2 + 5949^2 .

It is a junction number, because it is equal to n+sod(n) for n = 211509998 and 211510025.

It is not an unprimeable number, because it can be changed into a prime (211510043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52877509 + ... + 52877512.

Almost surely, 2^211510042 is an apocalyptic number.

211510042 is a deficient number, since it is larger than the sum of its proper divisors (105755024).

211510042 is a wasteful number, since it uses less digits than its factorization.

211510042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105755023.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 211510042 is about 14543.3848192228. The cubic root of 211510042 is about 595.8134879508.

Adding to 211510042 its reverse (240015112), we get a palindrome (451525154).

The spelling of 211510042 in words is "two hundred eleven million, five hundred ten thousand, forty-two".