212510009 has 2 divisors, whose sum is σ = 212510010. Its totient is φ = 212510008.

The previous prime is 212509993. The next prime is 212510069. The reversal of 212510009 is 900015212.

212510009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153834409 + 58675600 = 12403^2 + 7660^2 .

It is a cyclic number.

It is not a de Polignac number, because 212510009 - 2⁴ = 212509993 is a prime.

It is not a weakly prime, because it can be changed into another prime (212510069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106255004 + 106255005.

It is an arithmetic number, because the mean of its divisors is an integer number (106255005).

Almost surely, 2^212510009 is an apocalyptic number.

It is an amenable number.

212510009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212510009 is an equidigital number, since it uses as much as digits as its factorization.

212510009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 212510009 is about 14577.7230389386. The cubic root of 212510009 is about 596.7509648936.

The spelling of 212510009 in words is "two hundred twelve million, five hundred ten thousand, nine".