20421186279267 has 4 divisors (see below), whose sum is σ = 27228248372360. Its totient is φ = 13614124186176.

The previous prime is 20421186279239. The next prime is 20421186279367. The reversal of 20421186279267 is 76297268112402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20421186279267 - 2¹⁶ = 20421186213731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20421186279367) 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, 3403531046542 + ... + 3403531046547.

It is an arithmetic number, because the mean of its divisors is an integer number (6807062093090).

Almost surely, 2^{20421186279267} is an apocalyptic number.

20421186279267 is a deficient number, since it is larger than the sum of its proper divisors (6807062093093).

20421186279267 is an equidigital number, since it uses as much as digits as its factorization.

20421186279267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807062093092.

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 20421186279267 in words is "twenty trillion, four hundred twenty-one billion, one hundred eighty-six million, two hundred seventy-nine thousand, two hundred sixty-seven".