21040067616 has 24 divisors (see below), whose sum is σ = 55230177744. Its totient is φ = 7013355840.

The previous prime is 21040067537. The next prime is 21040067641. The reversal of 21040067616 is 61676004012.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109583590 + ... + 109583781.

It is an arithmetic number, because the mean of its divisors is an integer number (2301257406).

Almost surely, 2^21040067616 is an apocalyptic number.

It is an amenable number.

21040067616 is an abundant number, since it is smaller than the sum of its proper divisors (34190110128).

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

21040067616 is a wasteful number, since it uses less digits than its factorization.

21040067616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219167384 (or 219167376 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 21040067616 in words is "twenty-one billion, forty million, sixty-seven thousand, six hundred sixteen".