21331546476221 has 8 divisors (see below), whose sum is σ = 21375679852224. Its totient is φ = 21287414459520.

The previous prime is 21331546476209. The next prime is 21331546476223. The reversal of 21331546476221 is 12267464513312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331546476221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331546476223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34838906 + ... + 35445908.

It is an arithmetic number, because the mean of its divisors is an integer number (2671959981528).

Almost surely, 2^{21331546476221} is an apocalyptic number.

It is an amenable number.

21331546476221 is a deficient number, since it is larger than the sum of its proper divisors (44133376003).

21331546476221 is an equidigital number, since it uses as much as digits as its factorization.

21331546476221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679651.

The product of its digits is 1451520, while the sum is 47.

The spelling of 21331546476221 in words is "twenty-one trillion, three hundred thirty-one billion, five hundred forty-six million, four hundred seventy-six thousand, two hundred twenty-one".