212520634 has 4 divisors (see below), whose sum is σ = 318780954. Its totient is φ = 106260316.

The previous prime is 212520631. The next prime is 212520641. The reversal of 212520634 is 436025212.

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., 126495009 + 86025625 = 11247^2 + 9275^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212520599 and 212520608.

It is not an unprimeable number, because it can be changed into a prime (212520631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53130157 + ... + 53130160.

Almost surely, 2^212520634 is an apocalyptic number.

212520634 is a deficient number, since it is larger than the sum of its proper divisors (106260320).

212520634 is a wasteful number, since it uses less digits than its factorization.

212520634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106260319.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 212520634 is about 14578.0874602946. The cubic root of 212520634 is about 596.7609101089.

Adding to 212520634 its reverse (436025212), we get a palindrome (648545846).

The spelling of 212520634 in words is "two hundred twelve million, five hundred twenty thousand, six hundred thirty-four".