212320009 has 16 divisors (see below), whose sum is σ = 237312000. Its totient is φ = 188303760.

The previous prime is 212320007. The next prime is 212320019. The reversal of 212320009 is 900023212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212320009 - 2¹ = 212320007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212320001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257572 + ... + 258394.

It is an arithmetic number, because the mean of its divisors is an integer number (14832000).

Almost surely, 2^212320009 is an apocalyptic number.

It is an amenable number.

212320009 is a deficient number, since it is larger than the sum of its proper divisors (24991991).

212320009 is a wasteful number, since it uses less digits than its factorization.

212320009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 212320009 is about 14571.2047888979. The cubic root of 212320009 is about 596.5730650517.

The spelling of 212320009 in words is "two hundred twelve million, three hundred twenty thousand, nine".