561211212 has 12 divisors (see below), whose sum is σ = 1309492856. Its totient is φ = 187070400.

The previous prime is 561211177. The next prime is 561211213. The reversal of 561211212 is 212112165.

561211212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×561211212³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (561211213) 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, 23383789 + ... + 23383812.

Almost surely, 2^561211212 is an apocalyptic number.

It is an amenable number.

561211212 is an abundant number, since it is smaller than the sum of its proper divisors (748281644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561211212 is a wasteful number, since it uses less digits than its factorization.

561211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46767608 (or 46767606 counting only the distinct ones).

The product of its digits is 240, while the sum is 21.

The square root of 561211212 is about 23689.8968338826. The cubic root of 561211212 is about 824.8508880187.

Adding to 561211212 its reverse (212112165), we get a palindrome (773323377).

The spelling of 561211212 in words is "five hundred sixty-one million, two hundred eleven thousand, two hundred twelve".