21441533817 has 16 divisors (see below), whose sum is σ = 31276052928. Its totient is φ = 12958049280.

The previous prime is 21441533797. The next prime is 21441533819. The reversal of 21441533817 is 71833514412.

It is not a de Polignac number, because 21441533817 - 2¹⁰ = 21441532793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21441533819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 908668 + ... + 931965.

It is an arithmetic number, because the mean of its divisors is an integer number (1954753308).

Almost surely, 2^21441533817 is an apocalyptic number.

It is an amenable number.

21441533817 is a deficient number, since it is larger than the sum of its proper divisors (9834519111).

21441533817 is a wasteful number, since it uses less digits than its factorization.

21441533817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1841000.

The product of its digits is 80640, while the sum is 39.

The spelling of 21441533817 in words is "twenty-one billion, four hundred forty-one million, five hundred thirty-three thousand, eight hundred seventeen".