210122020209 has 4 divisors (see below), whose sum is σ = 280162693616. Its totient is φ = 140081346804.

The previous prime is 210122020181. The next prime is 210122020211. The reversal of 210122020209 is 902020221012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 210122020209 - 2⁸ = 210122019953 is a prime.

It is a super-2 number, since 2×210122020209² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210122020219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35020336699 + ... + 35020336704.

It is an arithmetic number, because the mean of its divisors is an integer number (70040673404).

Almost surely, 2^210122020209 is an apocalyptic number.

It is an amenable number.

210122020209 is a deficient number, since it is larger than the sum of its proper divisors (70040673407).

210122020209 is an equidigital number, since it uses as much as digits as its factorization.

210122020209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70040673406.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 210122020209 in words is "two hundred ten billion, one hundred twenty-two million, twenty thousand, two hundred nine".