212202009 has 12 divisors (see below), whose sum is σ = 307190676. Its totient is φ = 141155712.

The previous prime is 212201989. The next prime is 212202017. The reversal of 212202009 is 900202212.

212202009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 201782025 + 10419984 = 14205^2 + 3228^2 .

It is not a de Polignac number, because 212202009 - 2⁷ = 212201881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212201982 and 212202000.

It is not an unprimeable number, because it can be changed into a prime (212222009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21684 + ... + 29909.

It is an arithmetic number, because the mean of its divisors is an integer number (25599223).

Almost surely, 2^212202009 is an apocalyptic number.

It is an amenable number.

212202009 is a deficient number, since it is larger than the sum of its proper divisors (94988667).

212202009 is a wasteful number, since it uses less digits than its factorization.

212202009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52056 (or 52053 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 212202009 is about 14567.1551443650. The cubic root of 212202009 is about 596.4625264561.

The spelling of 212202009 in words is "two hundred twelve million, two hundred two thousand, nine".