212523434 has 4 divisors (see below), whose sum is σ = 318785154. Its totient is φ = 106261716.

The previous prime is 212523433. The next prime is 212523439. The reversal of 212523434 is 434325212.

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., 205779025 + 6744409 = 14345^2 + 2597^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (212523431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53130857 + ... + 53130860.

Almost surely, 2^212523434 is an apocalyptic number.

212523434 is a deficient number, since it is larger than the sum of its proper divisors (106261720).

212523434 is a wasteful number, since it uses less digits than its factorization.

212523434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106261719.

The product of its digits is 5760, while the sum is 26.

The square root of 212523434 is about 14578.1834945236. The cubic root of 212523434 is about 596.7635309104.

Adding to 212523434 its reverse (434325212), we get a palindrome (646848646).

The spelling of 212523434 in words is "two hundred twelve million, five hundred twenty-three thousand, four hundred thirty-four".