21440033016 has 64 divisors (see below), whose sum is σ = 54480729600. Its totient is φ = 7029724800.

The previous prime is 21440033003. The next prime is 21440033077. The reversal of 21440033016 is 61033004412.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733726 + ... + 762386.

It is an arithmetic number, because the mean of its divisors is an integer number (851261400).

Almost surely, 2^21440033016 is an apocalyptic number.

It is an amenable number.

21440033016 is an abundant number, since it is smaller than the sum of its proper divisors (33040696584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21440033016 is a wasteful number, since it uses less digits than its factorization.

21440033016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29180 (or 29176 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21440033016 its reverse (61033004412), we get a palindrome (82473037428).

The spelling of 21440033016 in words is "twenty-one billion, four hundred forty million, thirty-three thousand, sixteen".