21047408104 has 32 divisors (see below), whose sum is σ = 40053798720. Its totient is φ = 10367456256.

The previous prime is 21047408069. The next prime is 21047408183. The reversal of 21047408104 is 40180474012.

It is a happy number.

It is an unprimeable number.

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, 92859 + ... + 225205.

It is an arithmetic number, because the mean of its divisors is an integer number (1251681210).

Almost surely, 2^21047408104 is an apocalyptic number.

It is an amenable number.

21047408104 is a deficient number, since it is larger than the sum of its proper divisors (19006390616).

21047408104 is a wasteful number, since it uses less digits than its factorization.

21047408104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132649 (or 132645 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The spelling of 21047408104 in words is "twenty-one billion, forty-seven million, four hundred eight thousand, one hundred four".