212120646 has 16 divisors (see below), whose sum is σ = 424697904. Its totient is φ = 70630784.

The previous prime is 212120627. The next prime is 212120647. The reversal of 212120646 is 646021212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12831 + ... + 24266.

It is an arithmetic number, because the mean of its divisors is an integer number (26543619).

Almost surely, 2^212120646 is an apocalyptic number.

212120646 is an abundant number, since it is smaller than the sum of its proper divisors (212577258).

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

212120646 is a wasteful number, since it uses less digits than its factorization.

212120646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38055.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 212120646 is about 14564.3621899484. The cubic root of 212120646 is about 596.3862843499.

Adding to 212120646 its reverse (646021212), we get a palindrome (858141858).

The spelling of 212120646 in words is "two hundred twelve million, one hundred twenty thousand, six hundred forty-six".