21404506067273 has 4 divisors (see below), whose sum is σ = 24462292648320. Its totient is φ = 18346719486228.

The previous prime is 21404506067249. The next prime is 21404506067293. The reversal of 21404506067273 is 37276060540412.

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 21404506067273 - 2²² = 21404501872969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21404506067293) 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, 1528893290513 + ... + 1528893290526.

It is an arithmetic number, because the mean of its divisors is an integer number (6115573162080).

Almost surely, 2^{21404506067273} is an apocalyptic number.

It is an amenable number.

21404506067273 is a deficient number, since it is larger than the sum of its proper divisors (3057786581047).

21404506067273 is an equidigital number, since it uses as much as digits as its factorization.

21404506067273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057786581046.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 21404506067273 in words is "twenty-one trillion, four hundred four billion, five hundred six million, sixty-seven thousand, two hundred seventy-three".