20213112409 has 4 divisors (see below), whose sum is σ = 23100699904. Its totient is φ = 17325524916.

The previous prime is 20213112401. The next prime is 20213112427. The reversal of 20213112409 is 90421131202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90421131202 = 2 ⋅45210565601.

It is not a de Polignac number, because 20213112409 - 2³ = 20213112401 is a prime.

It is a super-3 number, since 3×20213112409³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20213112401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1443793737 + ... + 1443793750.

It is an arithmetic number, because the mean of its divisors is an integer number (5775174976).

Almost surely, 2^20213112409 is an apocalyptic number.

It is an amenable number.

20213112409 is a deficient number, since it is larger than the sum of its proper divisors (2887587495).

20213112409 is an equidigital number, since it uses as much as digits as its factorization.

20213112409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887587494.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 20213112409 in words is "twenty billion, two hundred thirteen million, one hundred twelve thousand, four hundred nine".