20211210122109 has 4 divisors (see below), whose sum is σ = 26948280162816. Its totient is φ = 13474140081404.

The previous prime is 20211210122057. The next prime is 20211210122111. The reversal of 20211210122109 is 90122101211202.

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 a cyclic number.

It is not a de Polignac number, because 20211210122109 - 2¹³ = 20211210113917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211210122189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368535020349 + ... + 3368535020354.

It is an arithmetic number, because the mean of its divisors is an integer number (6737070040704).

Almost surely, 2^{20211210122109} is an apocalyptic number.

It is an amenable number.

20211210122109 is a deficient number, since it is larger than the sum of its proper divisors (6737070040707).

20211210122109 is an equidigital number, since it uses as much as digits as its factorization.

20211210122109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6737070040706.

The product of its (nonzero) digits is 288, while the sum is 24.

The spelling of 20211210122109 in words is "twenty trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-two thousand, one hundred nine".