21621273216133 has 8 divisors (see below), whose sum is σ = 22893525099648. Its totient is φ = 20349067141824.

The previous prime is 21621273216121. The next prime is 21621273216149. The reversal of 21621273216133 is 33161237212612.

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-21621273216133 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 (21621273216233) 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 7 ways as a sum of consecutive naturals, for example, 10478191 + ... + 12370732.

It is an arithmetic number, because the mean of its divisors is an integer number (2861690637456).

Almost surely, 2^{21621273216133} is an apocalyptic number.

It is an amenable number.

21621273216133 is a deficient number, since it is larger than the sum of its proper divisors (1272251883515).

21621273216133 is a wasteful number, since it uses less digits than its factorization.

21621273216133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22904603.

The product of its digits is 108864, while the sum is 40.

The spelling of 21621273216133 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-three million, two hundred sixteen thousand, one hundred thirty-three".