20211312109 has 4 divisors (see below), whose sum is σ = 20224113760. Its totient is φ = 20198510460.

The previous prime is 20211312091. The next prime is 20211312127. The reversal of 20211312109 is 90121311202.

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 an interprime number because it is at equal distance from previous prime (20211312091) and next prime (20211312127).

It is a cyclic number.

It is not a de Polignac number, because 20211312109 - 2¹¹ = 20211310061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20211312109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211312139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6398457 + ... + 6401614.

It is an arithmetic number, because the mean of its divisors is an integer number (5056028440).

Almost surely, 2^20211312109 is an apocalyptic number.

It is an amenable number.

20211312109 is a deficient number, since it is larger than the sum of its proper divisors (12801651).

20211312109 is a wasteful number, since it uses less digits than its factorization.

20211312109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12801650.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20211312109 in words is "twenty billion, two hundred eleven million, three hundred twelve thousand, one hundred nine".