211420009 has 2 divisors, whose sum is σ = 211420010. Its totient is φ = 211420008.

The previous prime is 211420003. The next prime is 211420043. The reversal of 211420009 is 900024112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137545984 + 73874025 = 11728^2 + 8595^2 .

It is a cyclic number.

It is not a de Polignac number, because 211420009 - 2²¹ = 209322857 is a prime.

It is not a weakly prime, because it can be changed into another prime (211420003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105710004 + 105710005.

It is an arithmetic number, because the mean of its divisors is an integer number (105710005).

Almost surely, 2^211420009 is an apocalyptic number.

It is an amenable number.

211420009 is a deficient number, since it is larger than the sum of its proper divisors (1).

211420009 is an equidigital number, since it uses as much as digits as its factorization.

211420009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 211420009 is about 14540.2891649375. The cubic root of 211420009 is about 595.7289364272.

The spelling of 211420009 in words is "two hundred eleven million, four hundred twenty thousand, nine".