21547106616 has 64 divisors (see below), whose sum is σ = 62572423680. Its totient is φ = 6055390080.

The previous prime is 21547106551. The next prime is 21547106653. The reversal of 21547106616 is 61660174512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1041036 + ... + 1061531.

It is an arithmetic number, because the mean of its divisors is an integer number (977694120).

Almost surely, 2^21547106616 is an apocalyptic number.

It is an amenable number.

21547106616 is an abundant number, since it is smaller than the sum of its proper divisors (41025317064).

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

21547106616 is a wasteful number, since it uses less digits than its factorization.

21547106616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102644 (or 2102640 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 21547106616 in words is "twenty-one billion, five hundred forty-seven million, one hundred six thousand, six hundred sixteen".