212042531 has 4 divisors (see below), whose sum is σ = 214142064. Its totient is φ = 209943000.

The previous prime is 212042477. The next prime is 212042569. The reversal of 212042531 is 135240212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212042531 is a prime.

It is a super-2 number, since 2×212042531² = 89924069905771922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212042231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1049615 + ... + 1049816.

It is an arithmetic number, because the mean of its divisors is an integer number (53535516).

Almost surely, 2^212042531 is an apocalyptic number.

212042531 is a deficient number, since it is larger than the sum of its proper divisors (2099533).

212042531 is a wasteful number, since it uses less digits than its factorization.

212042531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099532.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 212042531 is about 14561.6802258531. The cubic root of 212042531 is about 596.3130674718.

Adding to 212042531 its reverse (135240212), we get a palindrome (347282743).

The spelling of 212042531 in words is "two hundred twelve million, forty-two thousand, five hundred thirty-one".